Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9d1bacc54c0b85…

MALICIOUS

PDF

39.8 KB Created: 2020-03-29 23:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: da7d48a1805acf46e19b2b892907ea0c SHA-1: ef40e45a13400542631f4d2634d82f6ffd978f43 SHA-256: 4a9d1bacc54c0b85798854bb95845e1ebfd6e6e20719146d0ba5cbb94ec30cf1
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. The primary lure appears to be a "Pwc patent litigation study", directing users to a specific HTML page. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

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://hotelvic-phase2-ja.devsite-1.com/uploads/1/3/1/0/131070523/131070523.html#pwc+patent+litigation+study
    • http://oneindieone.com/uploads/1/3/0/6/130640105/dapotaruzolofazawaba.pdf
    • http://allgreenwireless.com/uploads/1/3/1/1/131164132/e2208e7f.pdf
    • http://socaltbs2019.org/uploads/1/3/0/5/130589413/bavijofojevagaru.pdf
    • http://avenewlink.com/uploads/1/3/0/6/130604554/muvomuru.pdf
    • http://jrlfinancialplanning.com/uploads/1/3/0/2/130292179/8688581.pdf
    • http://hanglooseweb.com/uploads/1/3/0/5/130543093/2536309.pdf
    • http://charitylivingston.com/uploads/1/3/0/6/130605353/mixadojulizikemi.pdf
    • http://sheronneblasi.org/uploads/1/3/0/6/130639786/binizu.pdf
    • http://palasdesigns.com/uploads/1/3/0/4/130436272/mugozar.pdf
    • http://authenticallymecoaching.com/uploads/1/3/0/8/130814205/9031093.pdf
    • http://black-ventures.com/uploads/1/3/0/5/130540645/zutinaxudexo.pdf
    • http://barnowskifg.com/uploads/1/3/0/4/130488483/cc6ac95e12067a.pdf
    • http://canteenshop.com/uploads/1/3/0/5/130551670/sezanezenef-karana-fumanaropu-zipedonokox.pdf
    • http://cleosmokes.com/uploads/1/3/0/7/130775854/43247437aa0da02.pdf
    • http://modepassion.net/uploads/1/3/0/7/130740089/zudad_nanojenosakituk_lemidinekoze.pdf
    • http://acat.limo/uploads/1/3/0/9/130968976/5c5d1e3.pdf
    • http://themastermindlife.com/uploads/1/3/0/7/130740465/pudumimutaturim.pdf
    • http://topazhollowgoatsandsoap.com/uploads/1/3/0/6/130620459/koxuvepig-foratomusuk-xelugitod.pdf
    • http://rfleasingga.com/uploads/1/3/0/6/130639409/86357.pdf
    • http://sellnjnow.com/uploads/1/3/0/2/130272932/wobor.pdf
    • http://managewisconsin.com/uploads/1/3/1/1/131163980/6471746.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_off000072aa.bin
fb186f95041a26cc679273eff1e5c8fac366ae34da96ae5ee541ce2a18e7e259
pdf-font-stream PDF embedded font (sfnt) at offset 0x72AA 8012 bytes