Malicious PDF — malware analysis report

Static analysis result for SHA-256 126106a456c740d1…

MALICIOUS

PDF

88.6 KB Created: 2021-03-09 04:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9305a788eaa8d83888f8e28487021b77 SHA-1: c9165670dba31d668b2c334334a89017ea91afc1 SHA-256: 126106a456c740d15d845092d0e5b0657b2d284e697ff2d9f3a13d90b1912b74
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 pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

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://xezojetit.ru/award?keyword=convenios+internacionales+del+medio+ambiente+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470698/normal_6004189291487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390995/normal_60347a7e2d338.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/SZhhhjm/38710143680.pdfIn PDF document text
    • https://cdn.sqhk.co/zapimafe/jfOibid/free_robux_knife.pdfIn PDF document text
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/tigobaxalakafotawu.pdfIn PDF document text
    • https://sujugixuguxidi.weebly.com/uploads/1/3/4/6/134615921/takosagefiwiwukanes.pdfIn PDF document text
    • https://cdn.sqhk.co/vibesadebo/hgJifQm/daily_check_off_list_template.pdfIn PDF document text
    • https://cdn.sqhk.co/kagurase/jeib3hi/xotezeboremokunezuno.pdfIn PDF document text
    • https://tuverasoxodos.weebly.com/uploads/1/3/4/7/134745130/6710103.pdfIn PDF document text
    • https://daletapobuwero.weebly.com/uploads/1/3/4/6/134666872/mujavu.pdfIn PDF document text
    • https://cdn.sqhk.co/sabimejuka/ijhc5jg/fiboruv.pdfIn PDF document text
    • https://jenodaxadow.weebly.com/uploads/1/3/4/0/134012655/221976.pdfIn PDF document text
    • https://lafivejazep.weebly.com/uploads/1/3/4/7/134771341/3f64ac.pdfIn PDF document text
    • https://samabuwe.weebly.com/uploads/1/3/0/7/130739499/5701789.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/wufekubag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472768/normal_5fc95cee68c54.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://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_8010c3dbab83437d9b3c38f957fb1dce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/janodojivi/dupodewinigufezufa.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_a08f074b9b9845ac8d9a50fef52d8439.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/jufajasavodibikojufiw.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/mipavid.pdfIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_13d8367ca962498586e9b1edd81f4b41.pdf?index=trueIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_46f53565e3da45a0acdb9a3c442a4286.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/77285595320.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/zaramenusidezojinawev.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_off000104af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AF 5312 bytes
SHA-256: ba0a254e57165e5efdea950faf0ea762f1cf128162bd23118dedf7fed9cbda60
font_01_sfnt_off000116a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A7 15408 bytes
SHA-256: ba3c9e2e6fa87752acbe8d40fae4735e4b825f6ebc30fa72d83cffc5dd0bcc1d
font_02_sfnt_off0001448c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3