Malicious PDF — malware analysis report

Static analysis result for SHA-256 4240fb95dd9a7df8…

MALICIOUS

PDF

43.1 KB Created: 2020-04-04 08:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d972de8d4f1f3736a442a20af802d184 SHA-1: 508d79111be143738615aa7a80593946839630df SHA-256: 4240fb95dd9a7df86356ac0f26fad94096f102aec255bd88a7d5713fc2bd2b27
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the title 'Diferentes tipos de eventos academicos' and references to wkhtmltopdf, suggesting a lure document. The primary attack pattern involves directing users to a network of linked PDFs, likely for SEO spam or to host further malicious content.

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://chuzhappy.com/uploads/1/3/1/3/131380284/131380284.html#diferentes+tipos+de+eventos+academicos
    • http://owlsnestartgallery.com/uploads/1/3/0/7/130738792/talowamag_fuwilabunew_vokuvukuzi.pdf
    • http://farian-group.com/uploads/1/3/0/3/130313056/29eb47cf0c.pdf
    • http://westvillepainters.com/uploads/1/3/1/4/131453509/luxot.pdf
    • http://expatwall.com/uploads/1/3/0/7/130740387/nikiv.pdf
    • http://emgeecleaning.com/uploads/1/3/0/4/130483592/fekefudanuluj.pdf
    • http://thinco.org/uploads/1/3/0/7/130740389/mukirafadatawe_vepujageporobiv_goborijev_gevefete.pdf
    • http://matpoldachy.com/uploads/1/3/0/6/130603789/madudiserogo.pdf
    • http://annporcella.com/uploads/1/3/0/8/130874045/kixaraw.pdf
    • http://afarrar.org/uploads/1/3/1/0/131070325/92460f1d.pdf
    • http://equicanivita.ch/uploads/1/3/1/0/131070001/5317766.pdf
    • http://plexusbetterliving.com/uploads/1/3/0/5/130543772/ledodof.pdf
    • http://psyneways.com/uploads/1/3/0/5/130590443/sunotanewuber_gidumopegi.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_off00007d6b.bin
7541a5da5057b46c3c2c8ee12399a7b1a5d40d5b16b582284a6f7e18a5c6f9f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D6B 9872 bytes

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