Malicious PDF — malware analysis report

Static analysis result for SHA-256 32a8cf6a1ec575ab…

MALICIOUS

PDF

39.7 KB Created: 2020-03-25 13:59:43 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 32188086b2a89a582af7ab2cbd8211c8 SHA-1: 0a4a68dd1c3bd15feb795179d6c5f64be0a306f6 SHA-256: 32a8cf6a1ec575abce8ad30f1adef3dc1b9cab2068520f08fb632fa56fda9880
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains URLs that are also present in the link farm. This suggests the primary purpose is to direct users to a multitude of external sites, likely for SEO spam or to host 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://morrisoncohentherapy.com/uploads/1/3/0/8/130815192/130815192.html#hobbyking+x-car+120a+manual
    • http://mrspaynes.com.au/uploads/1/3/0/2/130287737/soxonezonuzoges_ruzelapuranop.pdf
    • http://whimbletails.com/uploads/1/3/0/6/130621038/ripuga-leperibawomezus-janawuvik.pdf
    • http://newconstructionchicago.com/uploads/1/3/0/5/130540304/simaluxe.pdf
    • http://huangguanwangzuqiutouzhugongsi.f18.ebkf.org/uploads/1/3/0/4/130436014/jatovejov_niwivosos_lalevodutiwasiv.pdf
    • http://metricdesignstudionyc.com/uploads/1/3/0/2/130288441/1429531.pdf
    • http://proutymotorsports.com/uploads/1/3/0/9/130969580/5936050.pdf
    • http://abrushwithdanger.com/uploads/1/3/0/4/130477083/mikavawelebu_wolilowamafogos.pdf
    • http://joinhomefrontrealty.com/uploads/1/3/0/6/130604779/958aa5.pdf
    • http://itskrisv.com/uploads/1/3/0/5/130543840/2643215.pdf
    • http://patternmylife.com/uploads/1/3/0/2/130287419/zumuf-vesakeninakal-xilelik.pdf
    • http://www.medcareambulance.com/uploads/1/3/0/8/130813646/pekoxaruwe.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_off00006fdd.bin
cd40482719239a6015747a2e899ac45b0ca13c68dd5c17e87ea8bfa12c107c9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDD 9500 bytes

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