Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a9a44cdca7cc4f…

MALICIOUS

PDF

81.4 KB Created: 2021-05-22 20:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 19e83260f4fff8e56cf79824e1c4f67a SHA-1: 5e8c8d1400bdc2627211b1cf5a71363e41ff4db5 SHA-256: c3a9a44cdca7cc4f205add66b9f5cd2b36e0f3b23d9a817534161f0f745b018b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or SEO manipulation tactic. The document body, though partially garbled, contains a title related to leadership, which is likely a lure to encourage clicks on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/strik?utm_term=what+is+difference+between+transformational+and+transactional+leadership PDF link annotation
    • https://zutiwijutorezaz.weebly.com/uploads/1/3/4/3/134354078/eb52b4879e9fef1.pdfIn PDF document text
    • https://ketowijogi.weebly.com/uploads/1/3/5/9/135985413/3293693.pdfIn PDF document text
    • https://xalekosud.weebly.com/uploads/1/3/5/3/135350534/ziwavolodotos-muvegonataka.pdfIn PDF document text
    • https://taxusuxegob.weebly.com/uploads/1/3/3/9/133997122/9882767.pdfIn PDF document text
    • https://mitenipup.weebly.com/uploads/1/3/4/3/134363071/mobodowupufuxus.pdfIn PDF document text
    • https://vulalubog.weebly.com/uploads/1/3/4/8/134862436/a5003420.pdfIn PDF document text
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/votejajiferola.pdfIn PDF document text
    • https://mituzeru.weebly.com/uploads/1/3/2/6/132681412/4443664.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/d9bb830b-0907-4d79-acba-4b391a7c0bc2/richmond_6g40-36f1_anode_rod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4e2a5dd-5b60-478d-987c-1771cb0e69f6/is_there_a_letter_j_in_aramaic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63a384d9-14a2-4613-87bc-56b12e72f8cc/55209976963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/229d95e4-38d3-4081-8c89-3915f0814e09/movie_maker_online_no_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c9d697d-585f-42ee-b221-4df1972a728e/interior_design_profession_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c7a9f0-72d1-41cc-8387-40f5a683fb8a/65588619963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41d8b64b-fd9d-4316-812e-42af652ecf2c/17611271174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42851923-ee5b-4d86-9c94-52f697136b20/54757365784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45eb8465-3b54-4dcb-9ed0-16cd83e1c6e6/brother_p-touch_h_100_r_bedienungsanleitung.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4259adf-b419-489c-b741-40136859840b/megajowuxarap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f49d9c06-9ee5-4529-9d73-e6e23d38d38b/how_to_change_the_fuel_filter_on_a_stihl_leaf_blower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccbb5fcf-f7a9-45c3-bfc0-af6e28e52766/how_much_does_1_litre_of_sunflower_oil_weigh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be5d6c5f-be62-401f-9acd-5b4280356fc5/26084045771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebd6689f-832f-4373-906e-5826f8a20376/22010903958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/449d70ff-b404-48f0-a1cf-424c5deb5bdf/80803592791.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d179ba-4779-4763-9ec6-f21e6d74daba/lewuduf.pdfIn 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_off0000fe43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 5640 bytes
SHA-256: 97d2094f0234f465994f668277dd6fb7a9a08fab94d7712b7c98498fc5b48e36
font_01_sfnt_off00011160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 11104 bytes
SHA-256: b173321d00ed15198443d8faf7f31a3a8714ffcd9948bc730fedd46120c4c623

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