Malicious PDF — malware analysis report

Static analysis result for SHA-256 7886ac90640674f8…

MALICIOUS

PDF

36.9 KB Created: 2020-03-30 05:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 79319142911fc6991d2e231438e14fe3 SHA-1: 0a92e5be1fb10459e15b9ab3ac43a0465944990e SHA-256: 7886ac90640674f89bbd46fae6341c5db872345e1eeaee09a6c0b5845638ff7a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a link farm or SEO spam, containing a large number of external links to other PDF documents hosted on various domains. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious nature of the embedded URLs. While no scripts were explicitly extracted, the structure and numerous external links suggest an attempt to manipulate search results or distribute malicious content indirectly.

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://afaparents.org/uploads/1/3/1/0/131070596/131070596.html#definicion+de+salud+oms
    • http://sartbreakthesilence.org/uploads/1/3/0/4/130435877/zikukiditijiriz.pdf
    • http://agropol.lv/uploads/1/3/0/6/130621130/bakakukake-nezubepovurud-fukovaso-xufux.pdf
    • http://audioking.fi/uploads/1/3/0/3/130313358/1806169.pdf
    • http://scubatom.com/uploads/1/3/0/5/130588201/kurisewimo.pdf
    • http://protossmetaleseng.com/uploads/1/3/0/8/130873912/4c83dea883.pdf
    • http://magg.club/uploads/1/3/0/6/130621809/824392.pdf
    • http://bluerising.org/uploads/1/3/0/2/130287302/47b02eb637.pdf
    • http://mmmooi.com/uploads/1/3/0/6/130620729/lixuzet.pdf
    • http://aunaturaleus.com/uploads/1/3/0/2/130272501/1221124.pdf
    • http://cryptoegypt.com/uploads/1/3/0/4/130488486/5969721.pdf
    • http://solsaic.ca/uploads/1/3/0/9/130969044/benut.pdf
    • http://bassania.org/uploads/1/3/0/7/130776493/vekoj-bukijavuxiru-mojovaxewitaju-xuwunona.pdf
    • http://shaziaimran.com/uploads/1/3/1/0/131070485/d964a15a.pdf
    • http://cg-baker.com/uploads/1/3/0/8/130813835/guzepavujitaxopel.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_off000068e3.bin
4f2ef010fb85cbd6ddf7bb8f00ebdc05e2d13279a0eff1528af2663b1e04c4bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68E3 7620 bytes

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