Malicious PDF — malware analysis report

Static analysis result for SHA-256 4afb283bd6ce832e…

MALICIOUS

PDF

75.3 KB Created: 2021-04-05 00:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76444971e8480954dcf61985baa4d16a SHA-1: 5b14f30da82fab0d40076ade4d55868f8243af93 SHA-256: 4afb283bd6ce832e71507e3bdfc4b15b18e292b3145b28838ef26e21dfb6cdb6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are used to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/wix?keyword=honors+chemistry+khan+academy
    • https://cdn-cms.f-static.net/uploads/4490369/normal_60316225902e0.pdf
    • http://nogurufegu.mygamesonline.org/full_bass_guitar_lessons.pdf
    • https://melitefikexaj.weebly.com/uploads/1/3/4/3/134315726/mivutilinake.pdf
    • https://vusejamujaled.weebly.com/uploads/1/3/1/4/131437056/mewefuwaweva-jisifoxi-jumel.pdf
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/4de832b5d9fd58.pdf
    • https://jufoxaju.weebly.com/uploads/1/3/4/4/134489692/4417320.pdf
    • http://werojati.getenjoyment.net/gewafujotesinu.pdf
    • https://tagalevef.weebly.com/uploads/1/3/0/8/130815582/noremup-zonumu-jizolazev-katoge.pdf
    • https://static.s123-cdn-static.com/uploads/4483589/normal_5fcd23ac9e143.pdf
    • https://cdn-cms.f-static.net/uploads/4405639/normal_60307811175e5.pdf
    • https://cdn-cms.f-static.net/uploads/4476757/normal_60214f469f5b2.pdf
    • https://cdn-cms.f-static.net/uploads/4384640/normal_5fd11b80347de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://404c0e03-56c4-4888-bb84-d9d32a71a3e4.filesusr.com/ugd/100e2e_93d564915a9941e28ca31df775783242.pdf?index=true
    • https://s3.amazonaws.com/rimejiguvif/jumixawo.pdf
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_7b26611d85574034b6665d67e1e1bd35.pdf?index=true
    • https://uploads.strikinglycdn.com/files/38ae4631-3b25-4ee2-b6e5-7fe30053e098/what_are_engineering_drawings.pdf
    • https://uploads.strikinglycdn.com/files/cd76c82c-150a-4371-9275-bf082a8113a6/introduction_to_stata_course.pdf
    • https://s3.amazonaws.com/bipepezuwed/wugedulew.pdf
    • https://uploads.strikinglycdn.com/files/4bbe3d36-4aa4-462d-b990-6fd51b5d30cb/nutaranim.pdf
    • https://uploads.strikinglycdn.com/files/d7fd1e12-7ddf-48c3-9b10-1e060548a6bf/94784121674.pdf
    • 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_off0000e82b.bin
8c2b2693c97a3fb62da28176eb03c1dd706a2dfd8004857bfde12bb09ebca1b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 5272 bytes
font_01_sfnt_off0000f9f4.bin
b227534277b5fe300cb675695e0df5fbf7596b98ddaf74e0e032f7652b53b78d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 10708 bytes

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