Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52be4c6f5943a20…

MALICIOUS

PDF

27.2 KB Authoring application: Mobipocket Creator
MD5: 8b78b5c511f906dd3a830b0c2576d503 SHA-1: 904319f4b1d22b7481758b67dcbbd41006dd861b SHA-256: b52be4c6f5943a20e161e97b56d152694b3f68f65d402d87ce63141ee7f550e6
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs pointing to other PDF files, a technique often used for SEO manipulation or to distribute malicious content. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' further supports a malicious intent. The document body itself is heavily obfuscated and contains some of the URLs, but does not provide clear user-facing text. No scripts were extracted from this sample.

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://cursivehand.us/uploads/1/3/0/5/130539913/buxonixikakuk-wogizijefogug.pdf
    • http://mynehab.org/uploads/1/3/0/6/130639444/1164478.pdf
    • http://kyewear.com/uploads/1/3/0/2/130272918/tesix-vimuvesal-saxomodefiju-waselefirujox.pdf
    • http://artvenom.com/uploads/1/3/0/3/130379058/266468.pdf
    • http://stephanienicole.org/uploads/1/3/0/3/130323335/97be18145a0cac.pdf
    • http://offpeaktraining.net/uploads/1/3/0/4/130490719/548b93a8.pdf
    • http://crafteroffun.com/uploads/1/3/0/6/130639792/e5a3dfcb38.pdf
    • http://akysora.com/uploads/1/3/0/6/130621006/ad0e7f792910d.pdf
    • http://www.belladraws4paws.com/uploads/1/3/0/7/130775827/cbedc4c1.pdf
    • http://mirrorsireland.com/uploads/1/3/0/5/130547340/dobuwevejin.pdf
    • http://rntaudioemusica.com/uploads/1/3/0/2/130289240/130289240.html#ficha+de+seguridad+acido+sulfurico+insht

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001547.bin
25ac009dd48113b444d44f12bd87621153957159e1fc84e35d6e802fab0a3108		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1547 7756 bytes

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