Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63f232c18008d26…

MALICIOUS

PDF

79.1 KB Created: 2021-03-04 15:28:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 197657f49ede9599a2e370c8390ff175 SHA-1: f204d9177f174b8202c8fc6aca6c75f92b084b82 SHA-256: f63f232c18008d26b609c9515e65dd41f9ae9f9937a92568267f8085e601597d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. One of the embedded URLs, https://fokemale.ru/award?keyword=bodyweight+exercises+lose+weight, is directly associated with the file's content, indicating a potential lure. The PDF structure and the presence of numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://fokemale.ru/award?keyword=bodyweight+exercises+lose+weight PDF link annotation
    • https://buvisipafen.weebly.com/uploads/1/3/4/4/134401595/44e9b5b9b311d43.pdfIn PDF document text
    • http://katipef.medianewsonline.com/what_is_the_capacity_of_kenmore_90_series_washer.pdfIn PDF document text
    • http://laitlabs.pro/variance_of_discrete_uniform_distributionggwo8.pdfIn PDF document text
    • https://xedasijaw.weebly.com/uploads/1/3/1/4/131453620/921e6.pdfIn PDF document text
    • https://julasunanuk.weebly.com/uploads/1/3/4/3/134308365/6772311.pdfIn PDF document text
    • https://bulugigedi.weebly.com/uploads/1/3/4/7/134714886/b064e84.pdfIn PDF document text
    • http://alex-travel.moscow/687097805306wvug.pdfIn PDF document text
    • https://kinuguno.weebly.com/uploads/1/3/1/4/131454024/wirup_wixepezef.pdfIn PDF document text
    • https://mukuriwubi.weebly.com/uploads/1/3/1/4/131483253/331052.pdfIn PDF document text
    • http://fuvagezilavez.mygamesonline.org/23829584954.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/limegetakukagivoxunapuna.pdfIn PDF document text
    • https://piwomokoxik.weebly.com/uploads/1/3/5/3/135335333/tawozusejaropake.pdfIn PDF document text
    • https://xufolonul.weebly.com/uploads/1/3/2/6/132695880/809c22ea0.pdfIn PDF document text
    • http://punejew.mygamesonline.org/how_to_replace_the_burners_on_a_weber_spirit_grill.pdfIn PDF document text
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/1938887.pdfIn PDF document text
    • https://vojizozovogimum.weebly.com/uploads/1/3/0/7/130740342/banogeben_jomewoxixa_mubin_pinenubuzuj.pdfIn PDF document text
    • http://swiss-gear-top.xyz/14637304878fh6xc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb313a1-0207-4675-bfe7-42b0b3a3b37f/when_is_the_4th_season_of_a_series_of_unfortunate_events_coming_out.pdfIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_b887800ce9c4404fbde039dccb833421.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/136ff868-5dc0-4727-b961-6a43263d4b90/what_is_geronimo_stiltons_real_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbe051eb-4fad-48f2-a60d-2c1f5d23ac71/used_dillon_reloading_press_for_sale_craigslist.pdfIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_d74a529dbbe642e28bfcc9c2ced4a0b7.pdf?index=trueIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_f0c983faadae478f882903318ef2547d.pdf?index=trueIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_78ace68894b04c0b9598c08cfd917c08.pdf?index=trueIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/ez_chill_auto_air_conditioning_recharge_sds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd38cdf-5db4-496c-950d-5c4f89b43fa1/samsung_galaxy_s9_plus_case_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9c05428-9f56-4e97-869a-dbf873545593/are_oven_bake_elements_interchangeable.pdfIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_e9c4837753774291836776e2f283d1cf.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D8 5304 bytes
SHA-256: 26dc982097667b21c5978dc16208838b64c40b0d828ee32b718bdfd5efd900df
font_01_sfnt_off00010c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 10132 bytes
SHA-256: 291bc64aa4e71444d09cd2518e7e0369680cc64dd9dc5e16dec203bc66618134