Malicious PDF — malware analysis report

Static analysis result for SHA-256 734a326e796afda3…

MALICIOUS

PDF

39.5 KB Created: 2020-03-09 01:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 73b6b926874f496b4d60f3397fb22e8d SHA-1: de83ea99a5030700983dddb87314bbe4c996e84a SHA-256: 734a326e796afda39c2998455709d7fa639bf3fdd854e34e3f3f1d70996be72c
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a PDF link farm, suggesting a tactic to manipulate search engine results or distribute further malicious content. The document body mentions merging PDF files using Java code, which is likely a lure to disguise the malicious intent of the embedded links. No scripts were extracted, but the heuristic firings strongly indicate a link-distribution scheme.

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://floyjoystudios.com/uploads/1/3/0/4/130436261/130436261.html#merge+pdf+files+using+java+code
    • http://wildfantasycat.com/uploads/1/3/0/6/130604046/aa87c792b826b.pdf
    • http://cockherodudes.com/uploads/1/3/0/3/130323407/jazanave.pdf
    • http://amteck.ca/uploads/1/3/0/3/130323962/bomupizinodove.pdf
    • http://easybillpro.com/uploads/1/3/0/3/130323151/xifafidesazure.pdf
    • http://webdisk.domainecadieux.com/uploads/1/3/0/6/130620501/57a80e23877.pdf
    • http://browsmithmbc.com/uploads/1/3/0/6/130621488/6475687.pdf
    • http://topcryptocurrency.com/uploads/1/3/0/6/130621113/5c773.pdf
    • http://midwifecalling.com/uploads/1/3/0/4/130489841/05d742f0dd1cd.pdf
    • http://redondoink.com/uploads/1/3/0/2/130273899/punefuju.pdf
    • http://davidbaskind.com/uploads/1/3/0/7/130739131/640d895ffb4.pdf
    • http://digitronicentertainment.com/uploads/1/3/0/7/130739474/buxirapij.pdf
    • http://abbotttestprep.com/uploads/1/3/0/4/130435986/2248848.pdf
    • http://starwaymarketing.com/uploads/1/3/0/6/130604423/mozufaxefogowonuwen.pdf
    • http://miguelsanostory.com/uploads/1/3/0/3/130323196/2882730.pdf
    • http://mobiledevblog.com/uploads/1/3/0/3/130323616/78f03d44a.pdf
    • http://nmation.org/uploads/1/3/0/7/130739864/pugabagi.pdf
    • http://ashleeelder.com/uploads/1/3/0/7/130776504/bd6f2174bf.pdf
    • http://www.pofcalls.com/uploads/1/3/0/5/130541763/ropepawudonene.pdf
    • http://pulleyautoparts.com/uploads/1/3/0/7/130738784/lilejanaxozeviv.pdf
    • http://www.southernmainetowing.com/uploads/1/3/0/6/130603834/9415664.pdf
    • http://www.laluzyoga.com/uploads/1/3/0/6/130621179/kapizibuvo.pdf
    • http://pioneertv.org/uploads/1/3/0/7/130740060/7698411.pdf
    • http://www.catherinemao.studio/uploads/1/3/0/7/130775590/2630488.pdf
    • http://mtglend.net/uploads/1/3/0/5/130589279/dunagi.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_off00006e36.bin
ab2375669aec7f901f6033cc96fe7bb4679d502a74a6c54de237a3bc33ba6cc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E36 8732 bytes

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