Malicious PDF — malware analysis report

Static analysis result for SHA-256 788270f150030c79…

MALICIOUS

PDF

41.8 KB Created: 2020-04-01 13:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4642c2baad22432cc3b890e8e469c54b SHA-1: 60fe667ef04f17a3d2e03b201bf14f4a761fa3eb SHA-256: 788270f150030c79185a920f4c136641b93830b1a165a1f3dcce254a4931d792
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of numerous links to unrelated domains supports this assessment. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine a more specific attack pattern beyond link distribution.

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://matthaynesfitness.com/uploads/1/3/1/4/131453459/131453459.html#sensor+de+temperatura+arduino+dht22
    • http://ihaveyourbackwithgator.com/uploads/1/3/0/9/130969510/939546.pdf
    • http://yosemiteoutdooradventure.com/uploads/1/3/0/6/130603731/2003497.pdf
    • http://navingulia.info/uploads/1/3/0/5/130590273/4138644.pdf
    • http://nygrill.com/uploads/1/3/0/6/130604922/7212195.pdf
    • http://aardvarkinsuranceacademy.com/uploads/1/3/0/2/130288456/betunavotavodarom.pdf
    • http://rowdybartending.com/uploads/1/3/0/5/130551179/c7c9263bddc6e7.pdf
    • http://thelifestylelottery.com/uploads/1/3/0/7/130740235/dajajomad.pdf
    • http://leslieslasagna.com/uploads/1/3/0/6/130621579/mepobuxu-barevusiw-tifuf-sarorawo.pdf
    • http://carriecorebodystudio.com/uploads/1/3/0/5/130544447/3961426.pdf
    • http://nokia-review.com/uploads/1/3/0/4/130435712/dafewalisebiji.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_off0000756e.bin
ddd9edb32f808a52bbb2144f0ddb16b57fa96f846d1c06613f03c4b0e179ee92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756E 9712 bytes

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