Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c609534ff7d20a…

MALICIOUS

PDF

46.4 KB Authoring application: Smallpdf Desktop
MD5: 1acdb462082bcb48e95e3e338b349032 SHA-1: 7c17e8267f91e3a96f69e97204e52725999a3b65 SHA-256: 85c609534ff7d20a1f7df542d7c8ce9cbd0554f1bb8afd562a134b25c2a08b3c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a mass external link farm, with numerous URLs pointing to other PDF files. This is indicative of a phishing or SEO poisoning campaign designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further payloads.

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nosymptom.org/uploads/1/3/0/6/130621431/7ddbc4e8d22674.pdf
    • http://www.samanthakellyjohnson.com/uploads/1/3/0/6/130620268/40067792b40f87.pdf
    • http://abileneallies.com/uploads/1/3/0/7/130739635/nonumesaneminite.pdf
    • http://crusade.capital/uploads/1/3/0/2/130270895/f3a5d.pdf
    • http://natashafine.com/uploads/1/3/0/6/130621116/2891147.pdf
    • http://ortigroupltd.com/uploads/1/3/0/5/130588225/jutej-nugib-rixom.pdf
    • http://webmail.vaweather.net/uploads/1/3/0/5/130544190/kujexuzixawojuju.pdf
    • http://shamusozmen.com/uploads/1/3/0/6/130621333/605a5724.pdf
    • http://skylight24.com/uploads/1/3/0/6/130639362/dosikik_poxukebixivo.pdf
    • http://panspermia.net/uploads/1/3/0/5/130589366/piruvo-vevaloz-vuwazizalo-zedevabufoseva.pdf
    • http://kayleighpeddie.com/uploads/1/3/0/4/130483862/3042613.pdf
    • http://bucknerhn.org/uploads/1/3/0/6/130639700/kugowawegu_nejet.pdf
    • http://tumayordeseo.com/uploads/1/3/0/5/130551127/5958922.pdf
    • http://dlrapartments.com/uploads/1/3/0/6/130639734/6734057.pdf
    • http://keeley-smith.com/uploads/1/3/0/2/130272631/3700697.pdf
    • http://abramsflooring.com/uploads/1/3/0/5/130551211/4815511.pdf
    • http://therightdoor.com/uploads/1/3/0/8/130813612/xonuzetefe.pdf
    • http://doylestownbotox.com/uploads/1/3/0/7/130739006/bidudoririletas.pdf
    • http://lancelinroadhouse.com/uploads/1/3/0/5/130550756/levubafokigigefebesi.pdf
    • http://belkran-bk.com/uploads/1/3/0/2/130273581/4428375.pdf
    • http://mypyxy.com/uploads/1/3/0/5/130551896/bonaxunigowoda.pdf
    • http://adsl-63-204-18-35.benefitplans.org/uploads/1/3/0/4/130435939/130435939.html#all+about+me+lesson+plan+for+preschoolers

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005527.bin
bfccb8c7546dc8f79ef9f7d09fda333a30a3d254d4103c7970230ada4220471c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5527 8144 bytes

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