Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe74fcd72bbb37d…

MALICIOUS

PDF

35.9 KB Created: 2020-04-09 16:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 14216aff0c778f6545eb26528283217c SHA-1: 7adf47c3317ed46faed6f1a23293548739fe654b SHA-256: fbe74fcd72bbb37d9ad52f9ba11ade8c6ee7dd766c31946ecd5cd8859bb66397
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to a link farm, likely for SEO poisoning or to serve further malicious content. 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://dropinautocare.com/uploads/1/3/1/4/131406502/131406502.html#bissell+powerglide+lift+off+pet+instructions
    • http://bridgereadvisorsllc.com/uploads/1/3/0/6/130603741/1d7908.pdf
    • http://melaniecalisephoto.com/uploads/1/3/1/0/131070597/nepovafuvamusew.pdf
    • http://deluxehomehvac.com/uploads/1/3/0/2/130271224/rajudalinole.pdf
    • http://waracalifornia.net/uploads/1/3/0/8/130813489/4990792.pdf
    • http://smsabq.com/uploads/1/3/0/2/130289426/6327672.pdf
    • http://renaesreadings.com/uploads/1/3/0/6/130640018/acf927.pdf
    • http://eventtimegreensboro.com/uploads/1/3/0/6/130621361/727d3ea8d.pdf
    • http://drop.systems/uploads/1/3/1/4/131453558/jejirukepaveko-gaxufek.pdf
    • http://attentionaustin.com/uploads/1/3/0/5/130551144/jififexi.pdf
    • http://1800petfood.com/uploads/1/3/0/5/130543107/xavezozijorof.pdf
    • http://yogata.org/uploads/1/3/0/5/130541188/kewagurebitus-bajeja-momuwol-numaxuvo.pdf
    • http://lipavingmasonry.com/uploads/1/3/0/5/130539798/puxawuxo.pdf
    • http://ecoinnphx.com/uploads/1/3/0/7/130775400/4f98747b208.pdf
    • http://purelifenickelfreeproducts.com/uploads/1/3/0/7/130775934/suvugalu_nogolikimu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053ab.bin
459280fb40d3e1341f09dc820f8fa7c5ecb2636ba6105adfc56b6a1648fc6ce2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53AB 6380 bytes
font_01_sfnt_off00006d44.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D44 16036 bytes

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