Malicious PDF — malware analysis report

Static analysis result for SHA-256 be2f61f8e53942ef…

MALICIOUS

PDF

66.6 KB Created: 2021-04-18 10:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aef3e85b7069ae03520f53aa1d8a51a3 SHA-1: 95acd212db8f80a242759e3b2cb190bedfc5f4b6 SHA-256: be2f61f8e53942ef4caf83133e2cac8e86fe3c1eef1f93ae2e8f29a2761ba2ea
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://aboss.by/sites/default/files/webform/zivexovoburowunaxomenip.pdf
    • https://www.a1touchsolution.nl/sites/default/files/87400145234.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/2923424149.pdf
    • https://www.mothercare.ro/sites/default/files/webform/resumes/jevosofotabotasif.pdf
    • https://www.afscme65.org/system/files/webform/tikat.pdf
    • https://www.a1touchsolution.nl/sites/default/files/26511902049.pdf
    • http://spotlight-sites.com/sites/default/files/webform/sizewavajifur.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/sidetarebuw.pdf
    • https://aboss.by/sites/default/files/webform/76513539396.pdf
    • https://www.woonsocketri.org/system/temporary/webform/kebadewanizokodijixupid.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/fipeforivu.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/99368311749.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dell+m4800+battery+not+charging
    • https://www.vub.be/sites/vub/files/webform/ludazerubadariwevulefaxu.pdf
    • https://gradfutures.princeton.edu/system/files/webform/49692556615.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/86402477901.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce0e.bin
00a6a354fd498c365b16f209ab71ce6d2159f7811813288823fe5c79425ae0ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0E 5700 bytes
font_01_sfnt_off0000e15d.bin
99f498058cf5187bf3ddcd1d1ee0dd33d0b768db6ae7a3e12b75086fd5b61a35
pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 10360 bytes