Malicious PDF — malware analysis report

Static analysis result for SHA-256 0deb2bc756088163…

MALICIOUS

PDF

34.3 KB Created: 2020-03-30 00:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 48adad85e60fe2bc77a54255450956d7 SHA-1: ead9f4bbe1ae5a75181c98874174e06729f237a7 SHA-256: 0deb2bc756088163a787850d218a4c211131411cbfb3d5a2e2a02fed72c78b6f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO manipulation tactic, likely intended to drive traffic or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://zambiasafarihunting.com/uploads/1/3/0/6/130639539/130639539.html#cuisinart+dlc+8+bowl+replacement
    • http://bakeline.ca/uploads/1/3/0/8/130874493/2109841.pdf
    • http://melancholymail.com/uploads/1/3/0/3/130380002/febadubalatex.pdf
    • http://laurenwolfinteriors.com/uploads/1/3/0/7/130776326/kubopafabavo.pdf
    • http://kksalescorporation.com/uploads/1/3/0/8/130874142/bexuvulebawid.pdf
    • http://runaroundhounds.com/uploads/1/3/0/7/130776241/muzopifidodimu_gasapolosimalim.pdf
    • http://perfectbalancehvac.org/uploads/1/3/0/2/130271229/kaxinabuxalub.pdf
    • http://guildfordhairstudio.com/uploads/1/3/0/7/130776810/xaluket-mumibelumude-rukolini.pdf
    • http://usilb.com/uploads/1/3/0/6/130621335/6da53cf64e06b.pdf
    • http://gratins.me/uploads/1/3/0/6/130620353/3208689.pdf
    • http://supportedparenting.org/uploads/1/3/0/3/130323817/9789503.pdf
    • http://quandocasei.com/uploads/1/3/0/4/130483801/3be43f44.pdf
    • http://onlineministrysharingwordofgod.com/uploads/1/3/0/8/130813975/1831005.pdf
    • http://novelconversations.org/uploads/1/3/1/3/131384407/6388153.pdf
    • http://centralvermontloggingandforestry.com/uploads/1/3/1/4/131437784/7333431.pdf
    • http://spiritualmidwiveslifecoach.org/uploads/1/3/1/1/131164321/gemesinagiz_wiped.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_off00005d19.bin
f690abb87c7bd1519f0cce7d9f7c2dfdcf55f235dd5f8e050af197f68ed7783c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D19 8024 bytes

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