Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc2d82df58cb910…

MALICIOUS

PDF

35.4 KB Authoring application: Smallpdf Desktop
MD5: e3454512f88e8f5d4f2325b82c14682f SHA-1: 52325d4d256b7a690d73d3edc72e7d49ff2dff34 SHA-256: afc2d82df58cb91024f99d4285fdf06e0713ec1caf41bbb5bc0661f68c0cc422
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The PDF_SEO_LINK_FARM heuristic specifically identified a large number of external PDF links, with the first being http://jeanniehouchins.com/uploads/1/3/0/6/130604934/3263041.pdf. This suggests the document's primary purpose is to redirect users to a network of malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jeanniehouchins.com/uploads/1/3/0/6/130604934/3263041.pdf
    • http://hamcox-ray.com/uploads/1/3/0/2/130271082/5176583.pdf
    • http://mywashcard.ca/uploads/1/3/0/7/130775398/wijuzugukodidaj.pdf
    • http://miamitownshiphealthandwellnesscenter.com/uploads/1/3/0/6/130639438/37d116ff9.pdf
    • http://moonshiners.net/uploads/1/3/0/5/130589213/114ac78154b520a.pdf
    • http://bradleyandsonsmaintenance.com/uploads/1/3/0/3/130313035/werivev-sejanukugaf-rafexomowame.pdf
    • http://nsuokchoirs.com/uploads/1/3/0/5/130588922/rirufelaxoritepozi.pdf
    • http://nuevaconciencia.info/uploads/1/3/0/3/130379341/xenib.pdf
    • http://contractorwholesale.com/uploads/1/3/0/4/130488396/130488396.html#non-defining+relative+clause

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000012e8.bin
ba863f150bb7fc9e5014786da6a6f372165b34b2ab86839424085cb70d044111		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8 6984 bytes

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