Malicious PDF — malware analysis report

Static analysis result for SHA-256 9282e94931bb8862…

MALICIOUS

PDF

40.8 KB Created: 2020-05-14 17:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 373fa159c5eea744c9631787510a9ec3 SHA-1: ba2f97af50c59345108836cc55ab19c69b4b2e12 SHA-256: 9282e94931bb88624c0383196a6768bb9b9a39a14a0f272a7f7244d6c11dde3c
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to domains that appear to be part of a link farm. The document body, though partially corrupted, suggests a lure related to 'Aulas básicas de inglês pdf'. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a network of suspicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://urfacefix.com/uploads/1/3/0/8/130873961/130873961.html#aulas+b%25C3%25A1sicas+de+ingl%25C3%25AAs+pdf
    • http://collegechickscleaning.com/uploads/1/3/0/7/130776687/woturenufajar.pdf
    • http://beatzbyaztroid.com/uploads/1/3/1/4/131408248/tobebav.pdf
    • http://wesfreshchickenoutletshoponline.com/uploads/1/3/0/6/130621765/1476427.pdf
    • http://inar-web.com/uploads/1/3/0/8/130873826/wixutuvuwajodux.pdf
    • http://kalyaansh.net/uploads/1/3/0/7/130738963/b852f.pdf
    • http://chinhuan.net/uploads/1/3/1/1/131164531/nimamigun-xonapafad-lanozavulisafa.pdf
    • http://un-guilty.com/uploads/1/3/0/2/130288661/vajujaseroj-munuzi-botexolizuwazop.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_off0000727a.bin
e80ee8ea389d06545d9b85bf991cf51eca06c3f1e5e7711a4a29c57152c3d635		 pdf-font-stream PDF embedded font (sfnt) at offset 0x727A 11492 bytes

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