Malicious PDF — malware analysis report

Static analysis result for SHA-256 810f316d54eb8d53…

MALICIOUS

PDF

28.4 KB Authoring application: Mobipocket Creator
MD5: 5b2fd94292fcedce1ee455852a4c933a SHA-1: 5180087ab074ec31c935b612c6182187a284d1e5 SHA-256: 810f316d54eb8d53c0f91975d3c9ae4d549c83283b69bd3f8df4de5f00c92fb1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to potentially harmful content or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://brandmediax.com/uploads/1/3/0/4/130478160/9243048.pdf
    • http://jaecstore.com/uploads/1/3/0/2/130270957/3ce64266.pdf
    • http://nuditosytrapitos.com/uploads/1/3/0/6/130605012/nuzaxutuzube-dugulelabi-sipeminizazim-tevudefomis.pdf
    • http://saharaexchange.com/uploads/1/3/0/5/130589274/b03b7.pdf
    • http://nusikeb.korova.fun/uploads/2020/01/28/0416a62fe2a.pdf
    • http://sono.kovriki.online/uploads/2020/01/27/2058461.pdf
    • http://zesugipana.sabuyjaishopping.com/uploads/2020/01/29/girifen_tugoxiwopemanem_pefenuxid_vojumodilo.pdf
    • http://mylighthouselearning.com/uploads/1/3/0/6/130620635/87f5f746cee.pdf
    • http://woodbinefarmandbrewery.com/uploads/1/3/0/5/130588407/3733971.pdf
    • http://pavowedizu.igorlucshii.online/uploads/2020/01/28/guwobefizoz-rekezopufe-fusowa-tozofepixaposif.pdf
    • http://jez.walkwork.info/uploads/2020/01/27/8e7321dd272e.pdf
    • http://furytheatre.org/uploads/1/3/0/3/130313103/miduvu.pdf
    • http://myfiveyearsplan.com/uploads/1/3/0/5/130539267/203c3b72.pdf
    • http://sonriseseattle.org/uploads/1/3/0/6/130621258/130621258.html#derive+variance+of+continuous+uniform+distribution

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000132d.bin
3a55951bfd93a93c39cc622026324e32f0f6b6f11283253d15b3454d0f5a725c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132D 6620 bytes

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