Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a1b0902cdda9af…

MALICIOUS

PDF

37.3 KB Authoring application: Smallpdf Desktop
MD5: 87f9e0d902371f5a9ca16a27d2a5f39c SHA-1: 60cf18bca783587e06b528c954644d2d9eb750d3 SHA-256: a3a1b0902cdda9af152f242aead17378efef4af57e344b616596398a124ce12e
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to phishing or malware distribution sites. The ClamAV detection and the PDF_SEO_LINK_FARM heuristic confirm the malicious nature of these links. The document body itself appears to be a lure related to IELTS writing tasks, but the primary malicious activity is the link farm.

Heuristics 3

  • 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.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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 http://sweetdreamsmarin.com/uploads/1/3/0/5/130540714/7374434.pdf
    • http://palmbeachhouserepair.com/uploads/1/3/0/4/130476351/9523554.pdf
    • http://corpseapple.com/uploads/1/3/0/4/130483766/bozuminaka-kuduzinep.pdf
    • http://sekworks.com/uploads/1/3/0/3/130379115/60dad96593b.pdf
    • http://cebuguam.org/uploads/1/3/0/4/130435938/gabonurepido_wazibotozaw_lekotuporo_furedoxitidorer.pdf
    • http://mirrormirrorministries.com/uploads/1/3/0/2/130289392/9810513.pdf
    • http://monicasfantasticcakes.com/uploads/1/3/0/5/130539479/1154190.pdf
    • http://claireleisringbuerkcounseling.com/uploads/1/3/0/2/130288426/5f0e922.pdf
    • http://nexgentestosterone.com/uploads/1/3/0/2/130291803/d9b744.pdf
    • https://sopasolojix.weebly.com/uploads/1/3/0/2/130289625/pawuxoziweta_boxarebirokakap.pdf
    • http://aubreyejones.com/uploads/1/3/0/4/130489072/4934078.pdf
    • http://ankezimmermann.ca/uploads/1/3/0/5/130540155/130540155.html#ielts+general+writing+task+2+sample+answer+band+8

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000012f4.bin
3d2a8fe19db302094760ec072c60c7f60e14c4de3e3f6306a25ad4194024d600		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4 7892 bytes

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