Malicious PDF — malware analysis report

Static analysis result for SHA-256 e982978a90f30ce5…

MALICIOUS

PDF

32.4 KB Created: 2020-05-16 06:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7df9558ad54d16031cdf0774164077c SHA-1: 9bed721869ddd408494a5ea698b51e75d902ee4d SHA-256: e982978a90f30ce53c6c1d055316db4be3f3eefd5a275f418e76a2fb26b7cbb2
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to a network of potentially malicious or ad-filled websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://baylandesign.net/uploads/1/3/0/2/130289577/130289577.html#chehra+masoom+ni+tera+song
    • http://hoovesandfeathersbarnyard.org/uploads/1/3/0/5/130547340/f0055d2bd28.pdf
    • http://brittanyroseveats.com/uploads/1/3/0/3/130323113/nolanitawu_wamaza.pdf
    • http://iredelldwilawyer.com/uploads/1/3/0/3/130323900/9548998.pdf
    • http://dchomeschoolcentral.com/uploads/1/3/0/3/130323092/jikanisowike.pdf
    • http://murrayutahrotary.com/uploads/1/3/0/8/130874379/sifijuruj.pdf
    • http://trutechnicalgaming.com/uploads/1/3/1/6/131606420/mizejaritelag.pdf
    • http://ballwatching.com/uploads/1/3/0/5/130539679/sesujorepunilus_wozipababokaba_jinitenit.pdf
    • http://msmcelroy.net/uploads/1/3/0/6/130621200/d2ccbc0954b671.pdf
    • http://bevpro.be/uploads/1/3/0/6/130639368/086388de711df.pdf
    • http://spanishwithflor.org/uploads/1/3/1/3/131380934/b4997ab.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_off0000527c.bin
c56186bd205010d25fe042cb66192e5e0ec4d45aa05f68b7ef0aa7c9076c4766		 pdf-font-stream PDF embedded font (sfnt) at offset 0x527C 10812 bytes

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