Malicious PDF — malware analysis report

Static analysis result for SHA-256 610762a9d62c8ce6…

MALICIOUS

PDF

39.4 KB Authoring application: Pdftk
MD5: a20cae48a9a343290a28b63f1fc7f0b9 SHA-1: 82aca46b18cb68087054848f256ee06dc1c46b26 SHA-256: 610762a9d62c8ce6fdba48d5365204efce89712497033891e59ecc8cfacf4528
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO farms or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. The embedded URL and the link farm suggest a campaign to redirect users to potentially harmful sites.

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://scienceofbeer.com/uploads/1/3/0/7/130740175/0b04df94bb23813.pdf
    • http://paxinter.net/uploads/1/3/0/6/130620341/6001860.pdf
    • http://lets-split.com/uploads/1/3/0/6/130621954/jixunutaxizupig.pdf
    • http://artlessonsbypaula.com/uploads/1/3/0/2/130287488/noduze.pdf
    • http://psychedaboutschool.com/uploads/1/3/0/2/130289244/4988110.pdf
    • http://sunshineboattours.com/uploads/1/3/0/5/130588708/mofidupigapegiwiruv.pdf
    • http://gajusty.store/uploads/1/3/0/5/130590368/7704d77878cb57d.pdf
    • http://moonflowerproduction.com/uploads/1/3/0/5/130590700/rovidiletufobapik.pdf
    • http://oasismethod.com/uploads/1/3/0/7/130739993/tasilawopu-lolonebaxeselol-sifakil.pdf
    • http://advancedrxtesting.club/uploads/1/3/0/8/130874189/nugeveleful.pdf
    • http://moabarealanduse.com/uploads/1/3/0/5/130588905/kotumolepe.pdf
    • http://perfectfixhandyman.com/uploads/1/3/0/5/130550925/5eb5ad13ad00e2.pdf
    • http://www.patriciaprestonpsychologist.com.au/uploads/1/3/0/6/130604430/3457599.pdf
    • http://vpokerfriends.com/uploads/1/3/0/5/130588151/644911337db.pdf
    • http://wysiwygfilms.com/uploads/1/3/0/7/130776518/wemeg.pdf
    • http://www.kingkekeshop.club/uploads/1/3/0/6/130604423/174d14171.pdf
    • http://milkandhoneystyletx.com/uploads/1/3/0/4/130476244/8538857.pdf
    • http://griyatalenta.net/uploads/1/3/0/8/130874543/cd7062067dd943.pdf
    • http://daciajones.com/uploads/1/3/0/7/130776726/lenaza-romavepasoboze-zevalidope.pdf
    • http://mingzhuyulechengxianjinbaijiale.br3h.com/uploads/1/3/0/8/130814055/130814055.html#diet+for+blood+group+b+positive

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003bd3.bin
1955f529a04fe8eae80b2b30bc5b6c50910e82d8b5c1d920b730980b2a1c6ebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3BD3 7764 bytes

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