Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7db7267b0aadc88…

MALICIOUS

PDF

35.8 KB Created: 2020-05-14 18:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bedb9488bb95d69186d8a4c47a39e970 SHA-1: 2ec3fddf18b744e7e76e1284ef6ab3fb2032f8fa SHA-256: c7db7267b0aadc888bf5d5daae0c9edfb45b4c9e58ca553c2edd354965215b1a
152 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Dropper.Agent and by an ML classifier as malicious. It contains a large number of external links, many pointing to PDF files with numeric slugs, indicative of a link farm or SEO poisoning strategy. The document body contains references to 'Baidu browser old version' and 'wkhtmltopdf', suggesting a potential lure or technical detail related to its generation. The primary attack pattern involves redirecting users to a vast network of external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.Dropper.Agent-8266339-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8266339-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://afaparents.org/uploads/1/3/0/2/130272909/130272909.html#baidu+browser++old+version
    • http://revdebbishop.com/uploads/1/3/0/6/130604782/7787217.pdf
    • http://drpauleyeschino.net/uploads/1/3/0/7/130738814/lolapeda-fesefi-gufuxi-vajunajumawave.pdf
    • http://aidbprestige.com/uploads/1/3/1/4/131409841/lenotukiwu-rupubigasalig-kevepebetu-kabitu.pdf
    • http://esplanade3proposal.com/uploads/1/3/0/4/130483074/1863427.pdf
    • http://newmandiamonds.com/uploads/1/3/1/4/131438556/85ea1833346229c.pdf
    • http://dombish.com/uploads/1/3/1/3/131380606/b062818e3c.pdf
    • http://bodydelux.com/uploads/1/3/1/4/131438241/zagafi.pdf
    • http://realizaciondelser.com/uploads/1/3/1/4/131438003/b84ed.pdf
    • http://linksofpearls.com/uploads/1/3/0/7/130776756/2ac52b3a7efd.pdf
    • http://lmbrowsandbeauty.com/uploads/1/3/0/7/130775557/gavasumepivi_javigozose_sodalidut.pdf
    • http://worldclub888.net/uploads/1/3/0/5/130588922/didagodadavem.pdf
    • http://ccmlou.com/uploads/1/3/0/3/130379297/nibuxasirorunumabo.pdf
    • http://velvetdx.com/uploads/1/3/0/2/130271080/sugilaje.pdf
    • http://alfa-spanish.org/uploads/1/3/0/7/130775372/motapomixurofadol.pdf
    • http://liloubella.com/uploads/1/3/0/9/130969042/71c04.pdf
    • http://pblaeh.com/uploads/1/3/0/5/130540026/jerokerag_gozabafegapudo_podanovavivego.pdf
    • http://worlders.net/uploads/1/3/0/6/130621917/mepavo.pdf
    • http://southfieldplumbing.org/uploads/1/3/0/7/130739251/duledusaku.pdf
    • http://rsmfleet.org/uploads/1/3/0/3/130313188/ximilunajoz.pdf
    • http://thomasconnection.com/uploads/1/3/1/4/131408086/luxetibudonedev.pdf
    • http://thereadingadvicehub.org/uploads/1/3/0/6/130621583/95bd07c2a20444.pdf
    • http://nepalifriend.org/uploads/1/3/0/5/130544118/bec7f.pdf
    • http://bsp500.org/uploads/1/3/0/6/130604112/44070ba4.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f84.bin
bc4cc70c1353738e30c776c366928a0846ed8a6ecfb33e8f4bfa291fbb372c9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F84 10728 bytes

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