Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea69ad2b6b3ce93…

MALICIOUS

PDF

39.4 KB Created: 2020-03-09 08:45:27 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 14128d61653b38530cc1bc12deb6d164 SHA-1: 7517f7883d1736318389491b3ab41baa6822efab SHA-256: 3ea69ad2b6b3ce93bef1a429508296c9f5bd328faeb808e0c9f85822090d37fe
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, characteristic of a link farm designed to drive traffic to other sites. The document body, though partially corrupted, suggests a lure related to downloading an 'Oxford collocations dictionary'. The primary malicious activity observed is the generation of a link farm pointing to numerous PDF files hosted on various domains, likely as a method to distribute further malicious content or engage in SEO manipulation.

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://9itgw.bpmtc.com/uploads/1/3/0/6/130639949/130639949.html#oxford+collocations+dictionary+for+students+of+english+free+download
    • http://invisiblehandconsulting.com/uploads/1/3/0/5/130589219/64ce48683d.pdf
    • http://bicyclemom.com/uploads/1/3/0/5/130588286/femab-bonixijitur-wesinugepubeniv.pdf
    • http://hostmaster.suemfraterartist.com/uploads/1/3/0/5/130550697/7d0afa.pdf
    • http://egweimaikale.com/uploads/1/3/0/6/130605505/mikupuzobixuxet.pdf
    • http://mvb4u.com/uploads/1/3/0/3/130379137/6551736.pdf
    • http://gotoclinical.com/uploads/1/3/0/6/130604263/3fa0cfd2c43e049.pdf
    • http://jcsqualityservices.com/uploads/1/3/0/8/130873863/vamujuwapulezufobuw.pdf
    • http://younglivingdaily.com/uploads/1/3/0/8/130874378/57544510d748b.pdf
    • http://neubrow.net/uploads/1/3/0/5/130539097/katotivod.pdf
    • http://sceamerrick.net/uploads/1/3/0/6/130620423/fulitipisosopigiji.pdf
    • http://whymegandoonan.com/uploads/1/3/0/6/130621459/d30b50347f51b52.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_off00006f7e.bin
d700691a29de99df8bbfd67d96d39b57e9d22b3539ff2a25a33140a5ce26c87a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7E 7816 bytes

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