Malicious PDF — malware analysis report

Static analysis result for SHA-256 5450bbeeff1bb97e…

MALICIOUS

PDF

35.1 KB Created: 2020-04-15 07:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2c61a4827e76000c965833f440686e5e SHA-1: b38b4d5e0dfc4cf630ba27aff7bd4eab76d69e8e SHA-256: 5450bbeeff1bb97efa06b9d3da473ccc7ac8aea97cc72a6c862f8ce1f937a940
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on unrelated domains and use numeric slugs, indicative of a link farm or SEO spam tactic. The primary heuristic firing, PDF_SEO_LINK_FARM, strongly suggests this is a malicious attempt to distribute content or malware via a deceptive lure. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the sheer volume of suspicious URLs points to a distribution or phishing campaign.

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://redhoneydew.com/uploads/1/3/1/6/131607075/131607075.html#photoshop+brushes+watercolor
    • http://yarnover.org/uploads/1/3/0/7/130739029/5102337.pdf
    • http://ethnicbusiness.org/uploads/1/3/0/5/130590162/4095469.pdf
    • http://totallooksalonandspa.com/uploads/1/3/0/2/130287284/7987303.pdf
    • http://blackoutpoems.com/uploads/1/3/0/7/130775306/lufekuboxepamo.pdf
    • http://functionalyoga.us/uploads/1/3/0/9/130969738/fuzebovijijilo_jukugirizufus_xowawotisikekaw.pdf
    • http://westtexasgunsandammo.com/uploads/1/3/0/6/130639706/zamesarewara.pdf
    • http://kubickconservation.com/uploads/1/3/0/4/130488780/jagutusokasi.pdf
    • http://asiandiamondlabs.com/uploads/1/3/0/6/130621258/renakaxefa.pdf
    • http://bogadancers.com/uploads/1/3/0/8/130814127/zetarejulugopev_seniwuxo_jagibamijum_vujegilozozexi.pdf
    • http://sharonjiang.com/uploads/1/3/1/1/131164295/bf419f208.pdf
    • http://artppe.com/uploads/1/3/0/7/130776737/kiximu.pdf
    • http://charlottesavinspsychotherapy.com/uploads/1/3/0/4/130488889/6861147.pdf
    • http://southerngirlcoffee.com/uploads/1/3/1/6/131637942/povibifefadekis.pdf
    • http://uniproconstruccio.com/uploads/1/3/1/4/131454155/5057243.pdf
    • http://bogadancers.com/uploads/1/3/0/8/130814127/zetarejulugopev_seniwuxo_jagibamijum_vujegiloz
    • 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_off00006266.bin
d2027e701147d3c7577b664bf89369fafbf2dd0c1daa8143f22cb24066745f75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6266 7612 bytes

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