Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fa73e5e0afd708…

MALICIOUS

PDF

80.1 KB Created: 2021-03-20 10:54:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6ea83639ccffce8bb69a258fcf28019 SHA-1: d488b4ce0c3fc49dfc8ac2410bdd642bf418011b SHA-256: 19fa73e5e0afd7086917101639b72ffe2bc65cfc306a31f348096948a509d7de
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or phishing campaign. The embedded URLs and the document body, though heavily obfuscated, indicate an attempt to trick users into downloading further malicious content by impersonating a legitimate software download. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/123?utm_term=internet+explorer++for+windows+10+64
    • https://cdn-cms.f-static.net/uploads/4492275/normal_603d41b98e324.pdf
    • https://cdn.sqhk.co/zafupusapun/YMdXhdF/zezufipetine.pdf
    • https://cdn-cms.f-static.net/uploads/4451561/normal_601093a190be7.pdf
    • http://smartline58.ru/falaxafalepazinuv89z.pdf
    • http://zathkatow.xyz/vapevunagds0ei.pdf
    • https://cdn.sqhk.co/kinanekoxo/heYuigw/53628508191.pdf
    • http://nature-ital.space/fireman_ed_jetsvy1n1.pdf
    • http://alexsaf.ru/17766031160ujwzf.pdf
    • https://cdn.sqhk.co/marixefe/qgisjiJ/8bit_painter_apk.pdf
    • http://italywow.pro/what_does_a_and_b_represent_in_van_der_waals0gicu.pdf
    • https://cdn-cms.f-static.net/uploads/4428052/normal_6054839662d6a.pdf
    • https://cdn-cms.f-static.net/uploads/4493209/normal_6012f357cfd67.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_fa96161fe7664c5b987ab6ff3faaa684.pdf?index=true
    • https://a26b494c-4f54-4b9d-aaa3-e02d462d315a.filesusr.com/ugd/c6268f_1b1b9ba6e7384680b677bcff6842b688.pdf?index=true
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_cb2364f3ff7348d8b165cba364933225.pdf?index=true
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_7e0ab392f806457495d484a9b6a4b923.pdf?index=true
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_229349f4a6304dcd9dd2da75a4d93fc7.pdf?index=true
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_313bf8e0542649c59bab484f277f47b2.pdf?index=true
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_2b58f23c74a640d382591f3c9c40d60c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f03c.bin
bb502c49840cdd52b1d5e2882e97d3398602d1d9d834758e0f347ea3c9f6338f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 5360 bytes
font_01_sfnt_off000102ae.bin
d053693d7d6dc63324dbba80f27d0b2bc1a7def4375799d89b812f5019c5d050		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 21228 bytes

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