Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ae55146622adaf…

MALICIOUS

PDF

74.8 KB Created: 2021-03-22 18:41:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba77832ae6a2a11818a5b4af9fee9311 SHA-1: 8173dfc861c9046ce51e0233e6d9212e5496d272 SHA-256: f8ae55146622adaf9b20681392ff0c8cf50cb5e029e4ff87798da360209ca0c6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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-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://botokaw.ru/wix?keyword=rug+doctor+machine+user+guide
    • http://shop-kid-toys.online/dua_e_hizbul_bahr_in_englishdkegx.pdf
    • https://cdn-cms.f-static.net/uploads/4427313/normal_602099bfa4e68.pdf
    • http://ergors.space/sumomijejegeje88rfh.pdf
    • https://jowatoziji.weebly.com/uploads/1/3/4/8/134893097/3150937.pdf
    • https://jaxedafotonomut.weebly.com/uploads/1/3/4/8/134885779/34cfd3f8e051.pdf
    • https://tusemebi.weebly.com/uploads/1/3/4/3/134316443/8790081.pdf
    • https://cdn-cms.f-static.net/uploads/4500669/normal_60176aff46066.pdf
    • https://static.s123-cdn-static.com/uploads/4388819/normal_5fca99592bf89.pdf
    • https://cdn-cms.f-static.net/uploads/4425916/normal_602921cb2d884.pdf
    • https://jojusilinu.weebly.com/uploads/1/3/4/3/134343509/5993875.pdf
    • https://static.s123-cdn-static.com/uploads/4413119/normal_5fe44a585de7f.pdf
    • https://static.s123-cdn-static.com/uploads/4376126/normal_5fe4c42ce0278.pdf
    • https://dabosimupit.weebly.com/uploads/1/3/5/3/135397997/samoz_vedakalugaza_potojivij.pdf
    • https://divupitibi.weebly.com/uploads/1/3/4/3/134328085/7645237.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/legipalofi/sojonozixukavubuxeteda.pdf
    • https://s3.amazonaws.com/luropi/fill_in_calendar_template.pdf
    • https://s3.amazonaws.com/bojafazes/45522604408.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_off0000e7b0.bin
564435cfe675bc4444ff3417d829c3ca5628fc8906ac1c0f3ed871ecc36f5a5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B0 5328 bytes
font_01_sfnt_off0000f9a7.bin
3be928475c5bec5d8349379dfb1258130b28381803fbfcfe15acfd22eba015ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A7 10732 bytes