Malicious PDF — malware analysis report

Static analysis result for SHA-256 acbba1209f09f7a1…

MALICIOUS

PDF

76.5 KB Created: 2021-06-04 13:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 68e80132280567c3113a11919c5166b8 SHA-1: 25bd8432bec6e7f4a887555c41509c8574fff54f SHA-256: acbba1209f09f7a1865287b8b6493d47164bb49618a6e16190f79aea6a670738
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded URLs and the document body, though heavily obfuscated, point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://wastran.ru/pbw?utm_term=jurassic+world+imagenes+para+colorear PDF link annotation
    • https://saronikevuvu.weebly.com/uploads/1/3/4/4/134460573/623f1893946e.pdfIn PDF document text
    • https://gekomawaloloro.weebly.com/uploads/1/3/4/4/134443710/vafekelisoda.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4482872/normal_60b5f8cfd261c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496389/normal_5fefd8691ac36.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/ponemofiv.pdfIn PDF document text
    • https://gajorimimexawi.weebly.com/uploads/1/3/4/4/134458849/2762788.pdfIn PDF document text
    • https://mifitulu.weebly.com/uploads/1/3/4/5/134521308/rejuwilavuwopow.pdfIn PDF document text
    • https://katatowuli.weebly.com/uploads/1/3/4/8/134879603/lemixux.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://uploads.strikinglycdn.com/files/9d35e6c8-1a02-4451-87de-8a6fed283a91/which_family_has_2_valence_electrons.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/w/file/fetch/144443394/auto_tune_evo_vst_settings.pdfIn PDF document text
    • http://midevodimu.pbworks.com/w/file/fetch/144435495/pokemon_diamond_and_pearl_download_gba_rom_hack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faff0e06-8ede-4ce2-8ffb-0d682a56e51b/sony_str-dh500_watts_per_channel.pdfIn PDF document text
    • http://padimagofo.pbworks.com/w/file/fetch/144569628/bazume.pdfIn PDF document text
    • http://nitezug.pbworks.com/f/convert_form_to_docusign.pdfIn PDF document text
    • http://kusarolox.pbworks.com/f/fha_guidelines_for_peeling_paint.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144416682/7512241316.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/f/context_clues_worksheet_7th_grade.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF05 5276 bytes
SHA-256: 87bce9d2a6118504dd0723617612aad684b1fd83a2b3adc72de498d8ea84f03e
font_01_sfnt_off0000f0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 11128 bytes
SHA-256: 1bb371f5e31c27e6c4a2cdc8686616706a91cd5a06c7317e04e3347bfab498ca
font_02_sfnt_off00011544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11544 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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