Malicious PDF — malware analysis report

Static analysis result for SHA-256 f336a55ef54463c9…

MALICIOUS

PDF

34.2 KB Created: 2020-05-23 10:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a18824eb7ecda60e5d7d3bbaf0a4450 SHA-1: 11eb23f621f534946a87f7282e74b9dfe28e44f9 SHA-256: f336a55ef54463c9d92792b2fa351d841a42431bbb74181f882b03c32f9e9239
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to other PDF files hosted on various domains. This behavior is indicative of a link farm or a content distribution network designed to obscure the ultimate malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the interpretation that it is part of a malicious campaign. No scripts were extracted, and the document body was largely unreadable, making it difficult to determine the exact nature of the lure.

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://a1273717xstreamtravel.xsideas.com/uploads/1/3/0/4/130488500/130488500.html#dodge+dart+parts
    • http://lionizedvideo.com/uploads/1/3/0/4/130489157/3038906.pdf
    • http://sephotography.studio/uploads/1/3/0/7/130775655/nodosuwakotibufeg.pdf
    • http://thesedreams.life/uploads/1/3/0/8/130813966/gokukunisunomafu.pdf
    • http://2mp.undesirable.us/uploads/1/3/0/7/130738944/a6f18c94b809124.pdf
    • http://wildsidehikes.com/uploads/1/3/0/6/130620931/jekit.pdf
    • http://sanantoniotreeremoval.com/uploads/1/3/0/7/130739419/xifirugewizud.pdf
    • http://misupport.email/uploads/1/3/0/5/130539074/7311090.pdf
    • http://bradandersonconst.com/uploads/1/3/0/9/130969533/kuwesugi.pdf
    • http://carnivalstripes.com/uploads/1/3/1/0/131071035/cd9903a9660819.pdf
    • http://jarofeyes.com/uploads/1/3/0/3/130324288/5145557.pdf
    • http://irishoek.com/uploads/1/3/1/8/131871621/bazimoruzapobogilu.pdf
    • http://anythings.online/uploads/1/3/0/7/130739632/5994394.pdf
    • http://bulletphonecases.com/uploads/1/3/1/4/131437889/ragomolezu.pdf
    • http://riverofnoreturnidaho.com/uploads/1/3/1/0/131071076/7a4dc4.pdf
    • http://elitemovers.net/uploads/1/3/0/5/130544468/3924043.pdf
    • http://refreelance.com/uploads/1/3/0/4/130435547/dipitizixunowu.pdf
    • http://kellybunn.com/uploads/1/3/1/3/131398185/3506240.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_off00005add.bin
c33f86c1c917fa3747dfc5044bfb8b11ff52cc9fe3fab3f6f7514003feb0c13a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADD 10216 bytes

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