Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73e2519491edf34…

MALICIOUS

PDF

74.8 KB Created: 2020-12-17 06:05:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f47f0ac5dbc8d24c60cd41ec65ded564 SHA-1: 99332aed6ea7cc1e3e120d9a98258d3526b38fcb SHA-256: c73e2519491edf341cc42ecdf98aefed04b00a5d8454657c14da285349b1cb28
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with the primary one being 'https://sebiwijojemobod.weebly.com/uploads/1/3/4/0/134097571/76006239bb4.pdf'. This suggests the document's purpose is to redirect users to potentially harmful content or facilitate SEO abuse. No scripts were extracted, but the PDF structure itself contains malicious links.

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://trafficel.ru/123?utm_term=franklin+high+school+maryland
    • https://sebiwijojemobod.weebly.com/uploads/1/3/4/0/134097571/76006239bb4.pdf
    • https://mivegogoke.weebly.com/uploads/1/3/4/3/134365655/195b1bf8ed7438c.pdf
    • https://devomejot.weebly.com/uploads/1/3/4/4/134491467/tidixobagozika_lebumak_tudotejine_nuwepoxewip.pdf
    • https://muvesajaduxu.weebly.com/uploads/1/3/4/0/134012660/1759844.pdf
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/mefosuwogo.pdf
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/04d4d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jepavilutabilel/96060780903.pdf
    • https://s3.amazonaws.com/selivuvumepaveb/23455124366.pdf
    • https://s3.amazonaws.com/vibuvomomuv/85644600182.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd1e4ada6d74665ac6cd90/1606229581192/linchpin_are_you_indispensable_review.pdf
    • https://uploads.strikinglycdn.com/files/254a2244-fa8e-443c-990e-bcaa765b1e21/gedovarirumedi.pdf
    • https://s3.amazonaws.com/jukezeluf/53656973082.pdf
    • https://s3.amazonaws.com/xefejevife/linear_algebra_system_of_linear_equations.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_off0000e72f.bin
5b544b4456cb66bc43e8e3ccdd61e802ab17c6be2fe62025d1025f37972fb4d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE72F 5472 bytes
font_01_sfnt_off0000f9ab.bin
cbbc7379a3c28da41ce2fd2fec1810554ba484716fefc17ce7d7804cbd306842
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 10736 bytes