Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc2a65a26998d7ec…

MALICIOUS

PDF

34.3 KB Authoring application: Mobipocket Creator
MD5: f85a65cb1722038705b83e8ba31ead16 SHA-1: 695c6df89b44c0ba8deacaf8958903b95b605eac SHA-256: cc2a65a26998d7ecac20b0f6a506bff59cee810ad928d7c8c444fa77ffb843ff
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics, including ClamAV and an ML classifier, indicating malicious intent. The primary malicious behavior observed is the presence of a large 'link farm' containing 22 embedded URLs, all pointing to external PDF files. This technique is commonly used for SEO poisoning or to distribute further malware. The document body itself contains a mix of seemingly random characters and some of these URLs, suggesting it's designed to be a lure or a container for these links rather than for human consumption.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://blitzfund.org/uploads/1/3/0/5/130588531/ae96dfa94d0.pdf
    • http://scenicsalem.com/uploads/1/3/0/4/130489830/tuvaf_jijarisivozo_mogobibip_rigugu.pdf
    • http://glendaletkd.com/uploads/1/3/0/8/130814246/ranoza.pdf
    • http://teszeri.com/uploads/1/3/0/5/130588225/3359583.pdf
    • http://event.mtanner.ch/uploads/1/3/0/9/130969973/wetokajinuma-kibivapuvizaxam.pdf
    • http://oldtowndoggiewash.com/uploads/1/3/0/8/130874433/fiboz.pdf
    • http://wakeforestfarmersmarket.org/uploads/1/3/0/6/130620776/3130903.pdf
    • http://subtleapplications.com/uploads/1/3/0/3/130379287/9232010.pdf
    • http://kramerlawfirm.net/uploads/1/3/0/5/130550700/bagemeratof.pdf
    • http://hostmaster.milfordgardenersclub.co.uk/uploads/1/3/0/2/130289320/c752086d562ed0b.pdf
    • http://www.greyandbird.com/uploads/1/3/0/3/130312923/nodekavuzujetuvivako.pdf
    • http://www.mtkasagiclimbingschool.com/uploads/1/3/0/6/130604986/130604986.html#preseptal+cellulitis+in+toddler

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000314e.bin
3d9fb9b12b5eaf05e1d77a9522bba29b8c40ce4ecf719abed07cdc497cbeb741		 pdf-font-stream PDF embedded font (sfnt) at offset 0x314E 8004 bytes

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