Malicious PDF — malware analysis report

Static analysis result for SHA-256 8240313260cce3fd…

MALICIOUS

PDF

84.3 KB Created: 2021-05-23 09:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87ed6f8e0519061baf45121471f147fe SHA-1: 22cf2da1fe80327e71f4b4d76c6be81fe4247748 SHA-256: 8240313260cce3fdcd2f70f1305c8649d014c70d1e029f6cf2490e92c4871481
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF documents, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the structure and heuristics point towards a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dopotalufiru.weebly.com/uploads/1/3/4/6/134601398/2411470.pdf
    • https://zepofujokedab.weebly.com/uploads/1/3/5/3/135315754/5117787.pdf
    • https://xizirujikalowev.weebly.com/uploads/1/3/1/4/131454807/bf6a39826a706.pdf
    • https://cdn-cms.f-static.net/uploads/4393763/normal_6042c80c4fbce.pdf
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/jidafogulebuniw.pdf
    • https://static.s123-cdn-static.com/uploads/4470205/normal_5fc6215106d4a.pdf
    • https://static.s123-cdn-static.com/uploads/4378848/normal_5fee133fa50ea.pdf
    • https://cdn-cms.f-static.net/uploads/4456686/normal_605a631c87649.pdf
    • https://cdn-cms.f-static.net/uploads/4447276/normal_60345cf7a4853.pdf
    • https://cdn-cms.f-static.net/uploads/4366063/normal_6039b16613a5d.pdf
    • https://zixavuxo.weebly.com/uploads/1/3/1/3/131398386/sefujinabemuniragi.pdf
    • https://cdn-cms.f-static.net/uploads/4386607/normal_606d68670173d.pdf
    • https://static.s123-cdn-static.com/uploads/4377113/normal_60069ced26fba.pdf
    • https://cdn-cms.f-static.net/uploads/4501212/normal_6054708f41fcd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/vAIYpVcV8Aw/wb?keyword=awareness%20the%20key%20to%20living%20in%20balance%20pdf
    • https://s3.amazonaws.com/vavabi/xakojakikerusima.pdf
    • https://s3.amazonaws.com/sowirutelevolur/pizusa.pdf
    • https://s3.amazonaws.com/niporofez/waduzudavategi.pdf
    • https://s3.amazonaws.com/kavifunaruvi/99730023546.pdf
    • https://s3.amazonaws.com/sorogamat/aavesham_movie_telugu_songs.pdf
    • https://s3.amazonaws.com/zakunafu/tevuzapali.pdf
    • https://s3.amazonaws.com/wetowuzuxit/does_tyson_die_in_the_sea_of_monsters_movie.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea4a.bin
69de0545a6af835791b4a474176a277023bdf1a5d4b5e7eb368526301d605dd1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 5864 bytes
font_01_sfnt_off0000fe52.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 1800 bytes
font_02_sfnt_off000106e0.bin
6fe4ba66ded8e52035ac2685e03dd2bef7cda862f93d265d44e8fa70f37017b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106E0 11636 bytes
font_03_sfnt_off00012e1b.bin
3a87a2a80cb0740ff7ad33dbd9b35031d90241dfccc5ab96a3d2c3133af9c3ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1B 16096 bytes