Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7353f9e95f4801…

MALICIOUS

PDF

36.9 KB Created: 2020-05-13 04:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d258a93f1cb9fa73bec1d0e9d6ce40e5 SHA-1: 94f43bb8a9cea7f7ff3c4977ef0ac01211b7d3c6 SHA-256: db7353f9e95f4801c4e996620f84b790f0e28d3b288e437f5674ccebbbdfcb16
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. The document body text is heavily corrupted, but the presence of the URL 'http://gotrsummit.com/uploads/1/3/1/8/131856937/131856937.html#service+cloud+certification+exam+guide' suggests a lure related to certification exams.

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://gotrsummit.com/uploads/1/3/1/8/131856937/131856937.html#service+cloud+certification+exam+guide
    • http://snowshovelmt.com/uploads/1/3/0/4/130436033/mafataxurut.pdf
    • http://soundofmusicsenseofart.com/uploads/1/3/0/6/130604903/gasapazeteruduvorufe.pdf
    • http://brittanyswales.com/uploads/1/3/0/4/130436152/0f8a5b94018.pdf
    • http://wickedslushcloverdale.com/uploads/1/3/0/7/130738997/e212c885c3.pdf
    • http://com-unlocked-valid-account.com/uploads/1/3/0/5/130589251/1732825.pdf
    • http://solar-crm.net/uploads/1/3/0/6/130639055/8403660.pdf
    • http://lancasterfair.org/uploads/1/3/1/3/131384536/kowugawinefa.pdf
    • http://bizprepsolutions.com/uploads/1/3/0/9/130969264/rosez.pdf
    • http://tobycovert.com/uploads/1/3/1/1/131163962/7675e67381a4b39.pdf
    • http://suredoneservices.com/uploads/1/3/0/2/130287995/mizodupow.pdf
    • http://dariussaffron.com/uploads/1/3/1/4/131408572/e37737b.pdf
    • http://sesproperties.com/uploads/1/3/0/4/130478057/4128460.pdf
    • http://acceleratesolution.com/uploads/1/3/0/6/130640126/70ddeca021d3d.pdf
    • http://ljungmagazine.com/uploads/1/3/0/4/130483852/6897029.pdf
    • http://nesoinc.com/uploads/1/3/0/5/130588813/4083268.pdf
    • http://busheyparishcharity.org/uploads/1/3/0/6/130620631/dureforewuf_kofebatemesefo_xajunibidamez_nowojigebakid.pdf
    • http://newheightsadventure.com/uploads/1/3/0/7/130739133/takawavogisonekuwe.pdf
    • http://floridagungear.com/uploads/1/3/0/6/130639774/sosigote-jutavakube-bibezipe-wonaporajikez.pdf
    • http://angelashemeshart.com/uploads/1/3/0/6/130603771/366b3.pdf
    • http://mrochebeauty.com/uploads/1/3/0/5/130538862/382080.pdf
    • http://learningagenda.org/uploads/1/3/0/5/130545333/jubusexujevofuxuseg.pdf
    • http://newheightsadventure.com/uploads/1/3/0/7/130739133/
    • 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_off00006576.bin
1eba0c1d57898f489c20d5d00a2f3af2e9600ea4cd1114f2ac361a60e38bbfbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6576 10000 bytes

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