Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af373baead1136f…

MALICIOUS

PDF

34.8 KB Created: 2020-05-21 11:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aeac8205c0969a9bac94fe8cc84c345b SHA-1: 4fe5c67f437b67ab5896259b5c418a7daf9dfee8 SHA-256: 5af373baead1136fbfd0ba6a0e330ccd2abb24611d15f439766c22493ab895eb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are structured as PDF files with numeric slugs, suggesting a link farm or SEO poisoning tactic. The primary external URI points to a page that appears to be a manual, likely a lure. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. No scripts were extracted, but the extensive use of external links points towards a phishing or malware distribution scheme.

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://wwwdaimondholiday.com/uploads/1/3/1/8/131857981/131857981.html#sherwood+rx5502+manual
    • http://sunflowerpreschoolsebastopol.com/uploads/1/3/0/9/130969190/6263652.pdf
    • http://craephotography.com/uploads/1/3/1/3/131379923/dowiwag-xuvus-gefujanififasij.pdf
    • http://dalecullis.com/uploads/1/3/0/3/130312937/vezitewikon.pdf
    • http://soupeduchef.com/uploads/1/3/0/8/130874372/jasijumegazabu_lanolu_karilazesuboxel.pdf
    • http://freedomfromthebanks.com/uploads/1/3/0/7/130776101/woladesib-mexewagubuvuzod-famuvolexobabag.pdf
    • http://fenixgraniteandmarble.com/uploads/1/3/0/7/130739443/4923223.pdf
    • http://frankwbrennan.com/uploads/1/3/1/4/131438242/3530337.pdf
    • http://mrswatsonsroom.com/uploads/1/3/0/3/130323547/712969.pdf
    • http://happystamperco.com/uploads/1/3/0/6/130639770/vesufawazolur.pdf
    • http://wkr-consulting.com/uploads/1/3/1/8/131856545/7d83131.pdf
    • http://jmaisd.org/uploads/1/3/0/6/130604758/3f442cc8b41.pdf
    • http://faveohousing.com/uploads/1/3/1/8/131856626/5e435d2.pdf
    • http://altoonasymphony.org/uploads/1/3/0/8/130814761/24e5726d4b0691.pdf
    • http://mikechmiel.com/uploads/1/3/1/4/131406284/3175919.pdf
    • http://hdimaggio.com/uploads/1/3/0/5/130590051/lilasazateluvo.pdf
    • http://roddarinsweitzer.com/uploads/1/3/0/4/130475901/jegakibusogimako.pdf
    • http://objectpages.com/uploads/1/3/1/4/131406288/wilofo.pdf
    • http://friendssafetyharborlibrary.org/uploads/1/3/0/7/130739646/vafogiponula.pdf
    • http://marcdyen.com/uploads/1/3/0/7/130740443/duvorituf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059fe.bin
82946ba6602a59559aec0f00c691506ac6f96f657a00457dabc85c35e7af23e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59FE 11016 bytes

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