Malicious PDF — malware analysis report

Static analysis result for SHA-256 c329eb5f8a2a0cfe…

MALICIOUS

PDF

34.5 KB Authoring application: pdf-parser First seen: 2020-09-24
MD5: 1d7b916b18105ba19d154e975b3f20d2 SHA-1: 84e903d687d1d3ffa460626bb2c685b78965bf26 SHA-256: c329eb5f8a2a0cfebaf149c7ac94ddff364d35e5eca1a97fb6051f7b4408f588
192 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical alert for a link farm containing 26 external PDF links, and a ClamAV detection for 'Pdf.Phishing.TtraffRobotInstall-7605656-0'. The ML classifier also assigned a high probability of maliciousness. The embedded document body text contains numerous URLs, reinforcing the link farm heuristic. The primary attack pattern appears to be SEO poisoning or a phishing lure, directing users to a large number of external PDF documents hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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.
  • 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://seti.chama.site/uploads/2020/01/28/535628.pdf In PDF document text
    • http://yilgarninfrastructure.com/uploads/1/3/0/6/130604836/wabanilorasonise.pdfIn PDF document text
    • http://professionalrenovationsofhamptonroads.com/uploads/1/3/0/4/130476736/nawiwumorutab-duzat-bagewib.pdfIn PDF document text
    • http://noeticpractices.com/uploads/1/3/0/4/130489080/jonafevatujoxa-tesavegobamur.pdfIn PDF document text
    • http://thetuba.net/uploads/1/3/0/3/130323462/1cbf0e775.pdfIn PDF document text
    • http://skazkashow.ru/uploads/2020/01/27/8330766.pdfIn PDF document text
    • https://zajabelajof.weebly.com/uploads/1/3/0/3/130379461/xosok.pdfIn PDF document text
    • http://augustahousekeeping.com/uploads/1/3/0/5/130551391/tozati_sorebidowavudo_gelaxa.pdfIn PDF document text
    • http://remnantstudios.com/uploads/1/3/0/6/130620940/5082567.pdfIn PDF document text
    • http://preciselocating.com/uploads/1/3/0/6/130621197/ad1847f502c6dca.pdfIn PDF document text
    • http://duga.secretcats.net/uploads/2020/01/28/bfa6dace80e5fd.pdfIn PDF document text
    • http://lonelyroadhandcraftedllc.com/uploads/1/3/0/6/130621501/4528482.pdfIn PDF document text
    • http://westranchswim.com/uploads/1/3/0/5/130551434/4192866.pdfIn PDF document text
    • http://edgelandscapeandmaintenance.com/uploads/1/3/0/5/130540284/130540284.html#graphs+and+charts+worksheets+pdfIn PDF document text

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326 7244 bytes
SHA-256: 166a620979bb469f4e91c98c0a3ca13089ec834a75806f8d604d3b1d5635fc3c

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