Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e1deeb7fdb62c1…

MALICIOUS

PDF

54.6 KB Created: 2020-03-22 05:48:06 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f954208b1df7fd3670762741ab6a458e SHA-1: 815a874e56c8cb15a57d6ed9ce122e726794b3c0 SHA-256: b8e1deeb7fdb62c1a0803126349b41ff8a9c808ca4ba79fcbd46d65bdc78cf81
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains a URL that points to a specific HTML page, and the majority of the extracted URLs are PDFs hosted on various domains. This suggests a campaign to drive traffic to these external resources, likely for SEO poisoning or to distribute further malicious 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://blackhawbuilders.com/uploads/1/3/0/5/130588246/130588246.html#poema+de+amor+para+un+esposo+cristiano
    • http://mx.kihearyou.com/uploads/1/3/0/2/130289734/152652.pdf
    • http://ronsidwell.com/uploads/1/3/0/6/130620653/wiganepatiseva_wobotox_detizosafenewo.pdf
    • http://mta-sts.mail.waag10.nl/uploads/1/3/0/7/130739540/zitali-reragexizasuni.pdf
    • http://criminalattorneysaltlake.com/uploads/1/3/0/4/130476089/600586.pdf
    • http://irvingunnerving.com/uploads/1/3/0/5/130547659/purevovola.pdf
    • http://220-server.signatureofstuart.com/uploads/1/3/0/7/130775171/2c0198fefab.pdf
    • http://workplayplan.com/uploads/1/3/0/6/130604529/jofobelawetalus-giwujama.pdf
    • http://heavyistheheart.com/uploads/1/3/0/2/130287988/78656d21149c.pdf
    • http://studioschoolla.org/uploads/1/3/0/7/130740195/736b2f86f94b8.pdf
    • http://thathappyplace.net/uploads/1/3/0/2/130288580/fatetuxevorasexelowe.pdf
    • http://www.ncccca.org/uploads/1/3/0/2/130288402/8928396.pdf
    • http://wildlife-cameraman.com/uploads/1/3/0/2/130288523/tonevumuvud.pdf
    • http://thesymphonychurch.com/uploads/1/3/0/5/130588191/pepitoge.pdf
    • http://tombloomkarate.net/uploads/1/3/0/6/130621156/70ca0e31d65867.pdf
    • http://chrisministries.com/uploads/1/3/0/8/130813705/tixizefo.pdf
    • http://cannaquencher.com/uploads/1/3/0/6/130621321/81c5bde.pdf
    • http://nicolealana.com/uploads/1/3/0/2/130288722/4441617.pdf
    • http://mobilsistemicg.me/uploads/1/3/0/4/130489350/dozojupivulomivo.pdf
    • http://www.thatscool.club/uploads/1/3/0/4/130490386/c6f75b58ac593.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_off0000aa7d.bin
fae8f063ffbedbcae9c8a13f88d7d6dd7db6a332648e1daca94b689981011dd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA7D 8876 bytes

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