Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7f5d8491018e50…

MALICIOUS

PDF

94.5 KB Created: 2021-06-06 22:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 920c2949f70e3673dc0c19ccd331100b SHA-1: 2302bedf40cfa032c5509b74df72549d9eafff9b SHA-256: ab7f5d8491018e501e3d22334b8a45416242bb9442ccf62062acae8690c8755d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://infrive.ru/pbw?utm_term=what+type%2528s%2529+of+intermolecular+forces+are+present+in+liquid+water PDF link annotation
    • https://kavafarosodox.weebly.com/uploads/1/3/4/0/134097584/kosus.pdfIn PDF document text
    • https://gigomafokat.weebly.com/uploads/1/3/4/7/134717504/wumanixuz-vifawatuz-sugika-gagukonodil.pdfIn PDF document text
    • https://dupevolorimix.weebly.com/uploads/1/3/4/5/134588768/favugivopu.pdfIn PDF document text
    • https://wuwudaxu.weebly.com/uploads/1/3/4/4/134493329/mexobamuka.pdfIn PDF document text
    • https://fiwigerisen.weebly.com/uploads/1/3/1/4/131408459/tugawejesomilu.pdfIn PDF document text
    • https://nisivijuwowog.weebly.com/uploads/1/3/0/8/130813757/750962.pdfIn PDF document text
    • https://gaxizizobepebi.weebly.com/uploads/1/3/0/7/130740618/6514378.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lakobun.pbworks.com/f/41699853169.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/28982318961.pdfIn PDF document text
    • http://nafidob.pbworks.com/w/file/fetch/144619272/download_dragon_ball_z_tenkaichi_tag_team_psp_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29b0bc00-33d4-4716-b983-cfa985ced586/12470081928.pdfIn PDF document text
    • http://wenuveraroto.pbworks.com/w/file/fetch/144529713/4564644245.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/f/12412311865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2158c2bc-88da-4384-9929-683d3f47c2fe/blue_and_white_christmas_ornaments_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d433f0d6-f41e-4839-a1e9-be51a1b61dba/older_snapper_riding_lawn_mower.pdfIn PDF document text
    • http://mibegenav.pbworks.com/f/how_to_search_source_code_in_github.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed4bef47-b59d-464e-b32a-69e74f024a7b/how_to_percentage_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/434da20f-4889-45a8-9c0c-1ba7b7a20d46/onkyo_tx-nr616_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03cc706d-8ff1-44b5-8cf8-4fdb3d239113/76845873601.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/58577706277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c4ec125-e156-4c58-9432-34d94c47c1d5/gimulapotosopet.pdfIn PDF document text
    • http://fufitan.pbworks.com/w/file/fetch/144668553/what_is_race_condition_explain_with_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eb8f319-f04e-4553-ab26-93db0c45cbaf/lulapukafesutumenabox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ff8793e-1b81-40af-979c-5816de143a80/the_monkeys_paw_foreshadowing_quotes.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_off00013243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13243 5880 bytes
SHA-256: 1637544c6de61ed331e5bf7cb84d3116dad884d5a0d24ff0c338db701074eac2
font_01_sfnt_off0001464a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464A 11016 bytes
SHA-256: 1c776e215b08cfa666dcf44b7bad4ba774577098f642b382b4494ab144e02ab3