Malicious PDF — malware analysis report

Static analysis result for SHA-256 773a54aa76a2fdf9…

MALICIOUS

PDF

33.4 KB Created: 2020-05-23 07:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca09d413b657705d9f6ef57562c33776 SHA-1: 47117de0860827c1889ecdf01ed324f0ca40746d SHA-256: 773a54aa76a2fdf9a3d76436a7a491e530eb0fd6c01f91678a45d3181656543f
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files on various domains, indicating a link farm or redirection scheme. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs and the structure suggest an attempt to manipulate search engine results or redirect users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://mychoicemedicalpractice.com/uploads/1/3/0/6/130605237/130605237.html#suzuki+dr+200+manual
    • http://agelessphotographs.com/uploads/1/3/0/6/130639915/xazewivawebepu_lewowakijoneboz_tilotezijifix.pdf
    • http://baselabstudios.com/uploads/1/3/1/4/131411474/lagalakomu.pdf
    • http://brooks-loulou.com/uploads/1/3/0/5/130551176/nizagokukadakaxiw.pdf
    • http://suplittleton.com/uploads/1/3/0/3/130313192/widabaxusi.pdf
    • http://gleneaglestouch.com/uploads/1/3/0/8/130874606/tosikejilinu.pdf
    • http://diaryofapissedoffflightattendant.com/uploads/1/3/1/4/131437891/ae0bf.pdf
    • http://mx.thestoreinstaunton.com/uploads/1/3/0/2/130291996/304ff0619bded.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056d9.bin
38030236f11a2e3eb9f28d707248724496b7c85479aea77b1d356e396231184b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56D9 10512 bytes

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