Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ca5242d5c46232…

MALICIOUS

PDF

38.3 KB Created: 2020-04-01 16:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fb812290e1aefa257afbb930af1f0eaf SHA-1: efde5d96f5aa35436293fa1c3f41853f40825afb SHA-256: c4ca5242d5c462325d7378a1dcb9a3429812d25c84816844c50b60851bf71b5e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document exhibits characteristics of a link farm, with a high density of external URLs pointing to various domains. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external links, suggesting a phishing or redirection attempt. The document body contains a title related to periodic table classification, likely a lure to disguise the malicious intent of the embedded links.

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://unicoiwinetrail.com/uploads/1/3/0/7/130775775/130775775.html#clasificacion+de+los+metales+no+metales+y+metaloides+en+la+tabla+periodica
    • http://cmfindlay.org/uploads/1/3/1/4/131407945/2734910.pdf
    • http://empowerdancewellness.ca/uploads/1/3/1/3/131379401/a0818cd57bd9.pdf
    • http://fanaticfitnesswa.com/uploads/1/3/0/7/130776572/selerabubaleji.pdf
    • http://ajflipitdesigns.com/uploads/1/3/1/0/131070776/kemodekunix-wukeza-vaferanigu.pdf
    • http://shwartzaag.com/uploads/1/3/0/2/130289550/1953948.pdf
    • http://hockeycorner.shop/uploads/1/3/0/8/130874518/8916807.pdf
    • http://safecitysecurity.com/uploads/1/3/0/4/130476322/defob-mesibit-dezaluto-givubijowax.pdf
    • http://gracecommunitychurchgrafton.com/uploads/1/3/1/3/131380915/gurefar.pdf
    • http://sweetbrookfarms.com/uploads/1/3/0/7/130775704/548f4ca.pdf
    • http://liveintshirts.com/uploads/1/3/0/6/130639495/4e157b6dae.pdf
    • http://mygypsysoulbrand.com/uploads/1/3/0/5/130550928/biwitegewed_nuxodebakavojaz_loneru_tumepotipalilu.pdf
    • http://heirloominstitute.org/uploads/1/3/0/6/130639554/nutowajulunuwom-tavef-maxugapud-tavabafes.pdf
    • http://kdhmining.com/uploads/1/3/1/4/131438068/8796396.pdf
    • http://equineperformanceservices.com/uploads/1/3/0/7/130739934/jazesezeso_zazazagitibepi_wopafagat_xonevokenafuz.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_off00006bfa.bin
eaa39a83f328355376d3d7cfd7c65ff7aaca190808d21d304a475ad98af087d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFA 7996 bytes

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