Malicious PDF — malware analysis report

Static analysis result for SHA-256 488976d79bf8b7da…

MALICIOUS

PDF

76.0 KB Created: 2021-03-29 06:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6fa99b7992b26f675822e80dfdd97343 SHA-1: 550f219d630580481c6d03cc6ee2c68bea12e7fa SHA-256: 488976d79bf8b7da39a56747a489ddadba450178170070c4048013c401352dde
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to manipulate search engine results or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/award?keyword=6th+grade+science+textbook+pdf PDF link annotation
    • https://cdn.sqhk.co/tememagitapo/ii2igZA/wesajarepa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476580/normal_5ffaccf2ec710.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/77098379478mrkyw.pdfIn PDF document text
    • https://lekaretuzej.weebly.com/uploads/1/3/0/7/130738752/70f1bae3661a3.pdfIn PDF document text
    • https://duxawedi.weebly.com/uploads/1/3/4/4/134477895/jawimipefes.pdfIn PDF document text
    • https://bazewubudib.weebly.com/uploads/1/3/4/7/134731154/vimobadoxetono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496812/normal_6043da653dacb.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/Nifheii/alienware_desktop_aurora_r9.pdfIn PDF document text
    • http://leomannapov.com/timex_ladies_watches_prices_in_pakistaneir1o.pdfIn PDF document text
    • http://saudiautoinsurance.com/buck_mcneely_theme_songyc31m.pdfIn PDF document text
    • http://moshon.space/49811118300vypwf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_6017cb093e422.pdfIn PDF document text
    • http://amsidgi.xyz/how_to_write_a_letter_of_recommendation_for_a_prospective_college_studentyxjyf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_4e9c36be304446beb8afd90247099985.pdf?index=trueIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_6cdab0b48bce43ab86393f8fdaeb052e.pdf?index=trueIn PDF document text
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_e7c0870255f447e68a31be5359a30b9b.pdf?index=trueIn PDF document text
    • https://7c3a386c-9197-44ff-a2a0-26a6be1b6260.filesusr.com/ugd/bba797_8d9095d290fd4ed78066d9f032356da1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD6 5504 bytes
SHA-256: 08464c50a7fe1fa8b01462c80631983fccc27abed3e83d2c67e9a24a9adc48a3
font_01_sfnt_off0000f078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 10512 bytes
SHA-256: 232e5c47e6d64dee1649cbb0af6978d6f3cb0df613c586709500e114f7045668
font_02_sfnt_off00011453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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