Malicious PDF — malware analysis report

Static analysis result for SHA-256 202ee75043b140d3…

MALICIOUS

PDF

45.5 KB Created: 2020-04-01 16:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f5430ff1310b5205a32548f37b70a28a SHA-1: d4d913dcd809528d3df213be96908772b69b5532 SHA-256: 202ee75043b140d375dca565d8a67f2be4e0f7ec1e701eae8a24ed400c12590b
94 Risk Score

Malware Insights

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

The PDF 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 document body, though partially corrupted, contains references to 'Subway sandwich nutrition guide' and the authoring application 'wkhtmltopdf', suggesting a potential lure to disguise the malicious link farm. The primary attack pattern involves redirecting users to a multitude of external sites, likely for SEO spam or to host further malicious content.

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://escorti-milano.com/uploads/1/3/0/7/130738859/130738859.html#subway+sandwich+nutrition+guide
    • http://gwl-services.net/uploads/1/3/1/0/131070334/veluwix.pdf
    • http://type1cloud.com/uploads/1/3/0/5/130590509/04ed3521.pdf
    • http://milesaweigh.com/uploads/1/3/0/4/130435947/6435547.pdf
    • http://nrdiamondclub.org/uploads/1/3/0/7/130738615/lunafe.pdf
    • http://bloodymaryeffect.com/uploads/1/3/0/6/130639464/lupive.pdf
    • http://colombe.org/uploads/1/3/0/7/130739627/7f079bd0ae77.pdf
    • http://stogywan.com/uploads/1/3/0/6/130620439/kexukopiravop.pdf
    • http://kcproclean.com/uploads/1/3/1/3/131382539/3290d88b865164.pdf
    • http://faithviewhc.com/uploads/1/3/0/6/130639036/motetituga_letarunir_netagoduzit_luzob.pdf
    • http://kissanecontractingllc.com/uploads/1/3/0/4/130435872/1449b12675f5dd.pdf
    • http://schoolofministrymissoula.com/uploads/1/3/0/6/130621312/2cc5b318f2f9553.pdf
    • http://jrobertshomes.com/uploads/1/3/0/3/130324292/1caeea74.pdf
    • http://freedomheroesusa.org/uploads/1/3/0/9/130970023/tokadu_kunakivapum.pdf
    • http://goddessmedianyc.com/uploads/1/3/0/8/130874240/781ec82a5.pdf
    • http://www.nautanotherbakingblog.com/uploads/1/3/0/5/130539922/28fc65.pdf
    • http://sportsptaustin.com/uploads/1/3/0/5/130543813/7ed880b78e2.pdf
    • http://thehousethatsoapbuilt.com/uploads/1/3/0/8/130874668/8254203.pdf
    • http://orlandosllc.com/uploads/1/3/0/6/130621503/67893a100.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_off00007dbd.bin
4be89a4aa0a156b8b21a39abb3d38c15eb0240a863c68b36de3d11681c74976a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBD 8308 bytes
font_01_sfnt_off00009d9b.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D9B 2616 bytes

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