Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3937f6c36bd006…

MALICIOUS

PDF

37.1 KB Authoring application: Smallpdf Desktop
MD5: e42bf165418219a6e0efff85c09336b2 SHA-1: 57584e10f791218fbf2d37431ade476165ba4dd3 SHA-256: 0c3937f6c36bd006650f4510a1ef62a77532b739c7ca33389042047ff3c9f16d
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links to external PDF files hosted on various domains, indicating a link farm or a distribution mechanism for further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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 link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pitchthefork.net/uploads/1/3/0/5/130551523/266105.pdf
    • http://www.crushedmxbygmp.com/uploads/1/3/0/4/130476709/vulitirufibu.pdf
    • http://firstmam.com/uploads/1/3/0/2/130272350/bakolozokigujes.pdf
    • http://patriotspointresort.com/uploads/1/3/0/2/130287493/4813089.pdf
    • http://nutritiongirl.org/uploads/1/3/0/5/130589085/lijuwasuxekowujuvara.pdf
    • http://mx.vcthunderfootball.org/uploads/1/3/0/9/130969631/3243.pdf
    • http://graphicdesigner.design/uploads/1/3/0/5/130543772/97e67d7149.pdf
    • http://pronaffiliates.net/uploads/1/3/0/7/130776393/giten.pdf
    • http://goodintegrationdeveloper.com/uploads/1/3/0/2/130287311/a79523bf0.pdf
    • http://fefegong.com/uploads/1/3/0/4/130483492/jadepabuwex-demetowis-toxarisugijom-zixetenogamelig.pdf
    • http://apslabgroup.com/uploads/1/3/0/7/130739401/d69eba5967fb48.pdf
    • http://ansepacceleration.net/uploads/1/3/0/7/130739253/raxevirujuva.pdf
    • http://parisinternationaldebutanteball.com/uploads/1/3/0/3/130313196/gugawis_lifajem_winabupuxuwom.pdf
    • http://www.bottom-linebookkeeping.com/uploads/1/3/0/9/130969514/janobumelojaluxukiv.pdf
    • http://mba-la.org/uploads/1/3/0/6/130604013/1800725.pdf
    • http://emagbaja.com/uploads/1/3/0/4/130489696/gavimifi.pdf
    • http://2dve3.salon225.com/uploads/1/3/0/5/130550961/130550961.html#fortalecer+rotadores+externos+de+cadera

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003424.bin
40c2213b769315b38f3bd95f867b2276ec87fb43b2220df8958c767e1bd66755		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3424 8756 bytes

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