Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d944442d3d6ade…

MALICIOUS

PDF

41.4 KB Created: 2020-03-21 21:25:24 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f676890efe80762b590f07351dba559c SHA-1: e92a7bea93cb7b4acc8f4a5213457c422be81d52 SHA-256: 98d944442d3d6ade7d8899e80794ba467104492b78cd2982c99aa494ebb023f5
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files on different domains, indicating a link farm. The document body text is minimal and appears to be a lure for search engines. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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://souljaboyisdead.com/uploads/1/3/0/4/130477335/130477335.html#para+que+sirve+la+espirometria+completa
    • http://the-wurst.com/uploads/1/3/0/5/130588594/3985620.pdf
    • http://www.bigeats.us/uploads/1/3/0/6/130639791/gozefududolexape.pdf
    • http://dripdropmedspa.com/uploads/1/3/0/5/130551330/d9b92.pdf
    • http://lvdivers.com/uploads/1/3/0/8/130813548/4bc35e439e71a4.pdf
    • http://mabuto.net/uploads/1/3/0/3/130379307/pozogarexu.pdf
    • http://lapersonalinjurylawyer.net/uploads/1/3/0/6/130603745/3564527.pdf
    • http://bpreparednow.com/uploads/1/3/0/2/130289279/4932320.pdf
    • http://goshoppinghere.com/uploads/1/3/0/4/130436209/fifezikunutuf_tizanepiforipir_japusigitu_javewo.pdf
    • http://djglo.com/uploads/1/3/0/2/130270905/wekug-vikevoku.pdf
    • http://trishasxtremeclean.net/uploads/1/3/0/6/130620687/watesikukik-nisimaz.pdf
    • http://pastoraaronowens.com/uploads/1/3/0/4/130488812/ec45d926c.pdf
    • http://ns3.meadowsparkapts.com/uploads/1/3/0/7/130739495/widojijunowoxazela.pdf
    • http://sevoparis.fr/uploads/1/3/0/8/130874592/5261881.pdf
    • http://sqk.me/uploads/1/3/0/7/130776065/lujuw.pdf
    • http://www.idlehourmaple.com/uploads/1/3/0/6/130604703/9f725451.pdf
    • http://theworkingconnectionllc.net/uploads/1/3/0/2/130289375/monux_dabipevagemes_lukamabifik.pdf
    • http://nekimastrategy.net/uploads/1/3/0/6/130621516/3992824.pdf
    • http://www.cakesbykassandra.com/uploads/1/3/0/2/130291415/wixotaguga.pdf
    • http://penaltyking.net/uploads/1/3/0/8/130874620/3058df6.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_off00007736.bin
0fdd5a15b67c903f846834867d6503f513dc4c8aa82fa19f96e1ca346d089b60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7736 8540 bytes

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