Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63b177e96948664…

MALICIOUS

PDF

31.3 KB Created: 2020-06-11 23:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 234846996dd48438adb2d242bffd3493 SHA-1: b8f1c7bc15f3ebd51cc3539fbaf59601f4217cd9 SHA-256: a63b177e96948664c3c375f248de54e538b66ca907ac5bc0c02963189d615578
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of outbound links points to a malicious intent, likely to manipulate search engine rankings or lead users to further malicious content. The document body contains a mix of seemingly benign text and embedded URLs.

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.
  • 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://mobina.org/uploads/1/3/1/4/131453329/131453329.html#skinny+love+piano+tutorial+slow
    • http://bonjourlanguageservices.com/uploads/1/3/0/7/130775167/pumes.pdf
    • http://hostmaster.baffinisland.ca/uploads/1/3/0/3/130324047/8295631.pdf
    • http://mindfulsead.com/uploads/1/3/0/8/130813577/jepuxijudu_waropik_remavawo_bopoj.pdf
    • http://ohmsweetohmmn.com/uploads/1/3/1/3/131398596/5316641.pdf
    • http://webdisk.kombiservisimerkezi.com/uploads/1/3/1/6/131636828/supenonaku_foraxexuxabuf_kopitisenewedab.pdf
    • http://rossschwaber.com/uploads/1/3/0/2/130274269/5265142fb.pdf
    • http://controllership101.org/uploads/1/3/0/7/130740391/6638786.pdf
    • http://paradisepropertyservice.com/uploads/1/3/0/7/130775076/3364730.pdf
    • http://mta-sts.mail.rikking.com/uploads/1/3/0/2/130287529/6188954.pdf
    • http://mail.speluqueros.com/uploads/1/3/0/5/130550910/87509f0f841.pdf
    • http://lexmorshipping.com/uploads/1/3/0/5/130590355/xopakonan.pdf
    • https://sivejinuz924761658.files.wordpress.com/2020/06/72788544818.pdf
    • https://fetusilexosu.files.wordpress.com/2020/06/37162017473.pdf
    • https://potasadodul.files.wordpress.com/2020/06/fisesitorafapulazugul.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_off00004ebb.bin
cfe88c726b31e3b79897693b429912241366ca93f1f6a2838614ee15a017ef5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EBB 10316 bytes

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