Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e37f98919da465c…

MALICIOUS

PDF

79.1 KB Created: 2021-03-27 10:51:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ac4a486d96497cd1cf91ea2dbd53bb48 SHA-1: 125f64c9d01f69c66e37707dc828e92ecfba1aa4 SHA-256: 8e37f98919da465cab1006898ea63624c178b31468f96b7ffd251fce579fa8ea
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 0.9993

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://ponafet.ru/wix?keyword=kahoot+answers+key PDF link annotation
    • http://geosen.net/rizuporapaz69v7s.pdfIn PDF document text
    • https://lobumemimakagom.weebly.com/uploads/1/3/3/9/133999871/6427914.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/OYgc7S6/metezufikefibopelolenoro.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/jaamhgM/63466424827.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/hf7Rgdn/11223562004.pdfIn PDF document text
    • https://cdn.sqhk.co/wofutajo/7kijigx/54738220101.pdfIn PDF document text
    • https://tufelonidozuwux.weebly.com/uploads/1/3/2/6/132681512/xafixazisexoz.pdfIn PDF document text
    • https://cdn.sqhk.co/fanabezom/O2Sjhyb/44919063158.pdfIn PDF document text
    • https://gimituwemowi.weebly.com/uploads/1/3/4/8/134872285/pefizuwaxajatep-femetumagam.pdfIn PDF document text
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/vebudivoxide-fujalirivikibek-mirugalareduv-monagomisa.pdfIn PDF document text
    • https://cdn.sqhk.co/bazexolareja/haxjahg/adidas_ultra_boost_19_star_wars_millennium_falcon.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/fickW8j/wogumagizimewidatifebuwo.pdfIn PDF document text
    • http://ighelpcenter.xyz/86467986597ci9m0.pdfIn PDF document text
    • https://jenifamizoj.weebly.com/uploads/1/3/5/3/135319667/liwebodos.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/ghnhd8j/dufupowilutadeberarob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/posamedevikateledem.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/birthday_wishes_pics_free.pdfIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_9499f85d5c7b43cf833cab4ad8642aab.pdf?index=trueIn PDF document text
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_579461514e3f4c47b4a91c9f46ef69cf.pdf?index=trueIn PDF document text
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_9f2eabbf22094e15a13a61c26ce5af33.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/is_the_hebrew_bible_the_original_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/gotapelevipodudaba.pdfIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_38710b4ba9914bb48fe6b8c639794a52.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/namah_serial_star_plus_song.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_off0000f8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C5 4968 bytes
SHA-256: 141fb4356371c15271d6790eb9e8fa4a6c9c81b6b1518edf7f553915a77f93a2
font_01_sfnt_off000109bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BB 10932 bytes
SHA-256: 63480cb3f24cb06e1f1f72f07e9d2ebd4fb6a79be8cc2ebcd87a2a1b1211a8d2