Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7a60f6dfbb6b73…

MALICIOUS

PDF

37.1 KB Created: 2020-04-08 15:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d5b83fef848bf11fabd07ee98ab84c37 SHA-1: b5a44ea936d81e0b46c17138f8b0cf89045f9e92 SHA-256: 0b7a60f6dfbb6b73a1d9fc942c9daeeab46cf0a8b867afdc8ba61b11e4b89abf
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs hosted on unrelated domains. This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious or compromised websites. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links is a common indicator of such schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://qualityautoservicetallerautomotriz.com/uploads/1/3/0/4/130483767/130483767.html#actividades+para+trabajar+la+atencion+en+los+ni%C3%B1os
    • http://carriekral.com/uploads/1/3/0/4/130476389/vokufaruguletitexiwe.pdf
    • http://griffincheney21.com/uploads/1/3/1/3/131380951/3921149.pdf
    • http://true-sustainability.com/uploads/1/3/1/0/131070071/d5b90f3e97182.pdf
    • http://socialstudieswithmj.com/uploads/1/3/0/7/130775448/figokixegemavo_silubeposode.pdf
    • http://halletoakfoundation.org/uploads/1/3/0/6/130620275/buvugusinukilukak.pdf
    • http://designsacredgarden.com/uploads/1/3/0/3/130313247/tubasezodu.pdf
    • http://bodyinmotionmuscletherapy.net/uploads/1/3/1/4/131408029/mefadidepek-mamadimug.pdf
    • http://visitmainstreetart.org/uploads/1/3/0/8/130874130/regobad-mimanug-rimokomawi-jedaminosan.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_off0000658d.bin
61e6b0f95388b5b86e28c1c770afd780d616301163fbfa5f6bb72230abcc1a24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x658D 8700 bytes

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