Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1a263f8bc79219…

MALICIOUS

PDF

36.1 KB Authoring application: GIMP
MD5: 1a53dfb0a1d0c13eed5ae93e556a5870 SHA-1: a959f5a32e1046261a0178608638551f9ed024a0 SHA-256: 4e1a263f8bc79219e088749157bf7cbbabe811c3622bec0d9dca5f6d57856da8
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of embedded URLs forming a link farm, with the primary domain being rmckendreeb.com. The document body, though partially corrupted, references 'Area and perimeter of triangles worksheet', suggesting a lure to disguise the malicious link distribution. The primary intent appears to be directing users to a network of external PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://rmckendreeb.com/uploads/1/3/0/6/130620835/942bb.pdf
    • http://buzap.lesnayazastava.ru/uploads/2020/01/27/wedine-rejipidopavijet-silatum-gopawitut.pdf
    • http://pigodizob.vipiski-besplatno43.icu/uploads/2020/01/28/ranerado.pdf
    • http://skydivetofino.ca/uploads/1/3/0/5/130588195/xuwidubiro-zularinijapuvi-kudozuge.pdf
    • http://disarabe.oleg-vytkin.ru/uploads/2020/01/29/f9559.pdf
    • http://nausettherapy.com/uploads/1/3/0/3/130379407/maleriwore_tagigof_jituginibobot.pdf
    • http://toponsitewellness.com/uploads/1/3/0/5/130543552/kevesavamobowizegobi.pdf
    • http://ked.amxbtc.com/uploads/2020/01/27/7132861.pdf
    • https://gerawaxojapo.weebly.com/uploads/1/3/0/5/130540128/3167747.pdf
    • http://bfmix.com/uploads/1/3/0/5/130588597/giwakipinut_dedezixisaxeb_kujunasoneriwi_fafajiriju.pdf
    • http://nuohotel-zh.devsite-1.com/uploads/1/3/0/2/130272898/130272898.html#area+and+perimeter+of+triangles+worksheet

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000128e.bin
56e86bdf0d46028aefd52560312861d4a4a5511f23352db2d2a4d17ec28bd651		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128E 7596 bytes
font_01_sfnt_off00004556.bin
669a22844ddb84b64a1d93eb6147c2b8b7ca76f4316fe4be2bbf69c96252e72a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4556 16180 bytes

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