Malicious PDF — malware analysis report

Static analysis result for SHA-256 958f2fc00c4b60f3…

MALICIOUS

PDF

44.8 KB Created: 2020-04-01 22:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e57e5da6aff413e27709ea2afb5f8ad3 SHA-1: 50723ca457c879b9f196759bf10ffb1d5e2e559b SHA-256: 958f2fc00c4b60f3b6d48c2704865ba91369202281406b4584b7c2e12c2e27e3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment

The PDF contains a large number of external links, many of which are to similarly structured URLs on different domains, suggesting a link farm or SEO poisoning tactic. The document body, though partially corrupted, contains a question that prompts users to click on these links. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious link structure. No scripts were extracted from this sample.

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://erinkjoller.com/uploads/1/3/0/7/130776487/130776487.html#can+clients+download+the+entire+gall
    • http://affordablepawns.com/uploads/1/3/0/2/130272417/pedobetubajiva.pdf
    • http://floryn.studiogemerkt.nl/uploads/1/3/0/9/130968995/muzaboje-nizuwi-fekigif-bagukemajukiw.pdf
    • http://futuraranch.com/uploads/1/3/0/8/130813777/916b6e.pdf
    • http://elainecleary.eu/uploads/1/3/0/6/130604575/52638.pdf
    • http://elementalalternatives.com/uploads/1/3/0/5/130590588/sogokutaromon.pdf
    • http://orleegolden.com/uploads/1/3/0/4/130483799/3e89a325.pdf
    • http://printsign.se/uploads/1/3/0/3/130312924/jiwij.pdf
    • http://a2zaccountants.org/uploads/1/3/0/4/130483117/8ecc16ec08.pdf
    • http://dashinglyonline.com/uploads/1/3/0/8/130813118/4d8d9397e77.pdf
    • http://giddyandgiggly.com/uploads/1/3/1/0/131070202/8709249.pdf
    • http://aaconsultant.org/uploads/1/3/0/7/130739250/2692777.pdf
    • http://westarnllc.net/uploads/1/3/1/3/131381614/belivobewilideb_felurosa_murabirebigepej.pdf
    • http://nysaafg.org/uploads/1/3/1/4/131409309/2c4166f01.pdf
    • http://mathandcoding.com/uploads/1/3/0/8/130813604/guzuve.pdf
    • http://houstonrooferpros.com/uploads/1/3/0/5/130544067/renowa.pdf
    • http://revelationsmagazine.com/uploads/1/3/1/3/131383314/361338d400ceeed.pdf
    • http://recentersessions.com/uploads/1/3/0/7/130738845/2134080.pdf
    • http://mensajeriaparada0.com/uploads/1/3/0/8/130874366/jababesubame.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_off00008831.bin
3213ee1d67a9e3f641f7dc5e0b68f320b2d6d4d2cfed1df9209f4b144b4cb328		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8831 7484 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.