Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa95453aed519e6…

MALICIOUS

PDF

37.8 KB Created: 2020-04-01 14:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f0909402cadb07fc8532ca5d69ca5360 SHA-1: 5513801aaa16751e1d7942ff2f33b298e571da45 SHA-256: baa95453aed519e6ff9399e15b0534df40618fabb751e87b77a88b2c0216bd9b
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The primary URL, http://holanomadas.com/uploads/1/3/0/8/130874238/130874238.html#corporate+finance+jonathan+berk+peter+demarzo+solutions, appears to be part of a link farm designed to drive traffic to various other PDF files hosted on unrelated domains. This suggests a malicious intent, possibly for SEO poisoning or to distribute further malware. No scripts were extracted from this sample.

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://holanomadas.com/uploads/1/3/0/8/130874238/130874238.html#corporate+finance+jonathan+berk+peter+demarzo+solutions
    • http://morganelizabethporter.com/uploads/1/3/0/4/130436439/ae0a6ec17d4e9b.pdf
    • http://propagandaculture.com/uploads/1/3/0/6/130639977/funosamazerejijav.pdf
    • http://talesfromalongtheway.com/uploads/1/3/0/7/130739658/beloxotumaf.pdf
    • http://www.quiltingcreationsbyamelia.org/uploads/1/3/0/3/130313590/mebogiviriwewo.pdf
    • http://bassania.org/uploads/1/3/0/7/130776493/vekoj-bukijavuxiru-mojovaxewitaju-xuwunona.pdf
    • http://robertletstalk.com/uploads/1/3/0/5/130551378/2884b3055.pdf
    • http://radiance4me.com/uploads/1/3/0/7/130774964/pexipukaru-didixojufomed-sekufepufi-xexawalavuki.pdf
    • http://scarboroughdispensary.com/uploads/1/3/0/4/130483338/tumebar.pdf
    • http://northvanmucisacademy.com/uploads/1/3/0/9/130969695/legurafubovolovusum.pdf
    • http://ogino-mpe-lab.dana-farber.org/uploads/1/3/1/4/131406714/5097261.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_off000069ed.bin
bc209aa7d50f26a667dc9d391d744e53904b1fdd3955e86ef737e4608843af9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69ED 8344 bytes

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