Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b38686ac61f76c…

MALICIOUS

PDF

37.6 KB Created: 2020-04-15 10:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b02804b7f77f07c8de06a1b9dead1458 SHA-1: 4b935a88811cc6d201ee9c199d88c3d88a8bf35b SHA-256: 11b38686ac61f76cbd173933d7c8f8eaa5c49471aa6c654dfa612cb93c763454
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farming or content distribution scheme. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of outbound links to potentially malicious or SEO-manipulated content indicates a high likelihood of a malicious intent, possibly to redirect users to phishing sites or download further malware.

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://ambtcex.com/uploads/1/3/0/8/130814466/130814466.html#various+types+of+reporting+in+journalism
    • http://applicationclicks.com/uploads/1/3/1/4/131483356/5018779.pdf
    • http://mycomplicatedlife.com/uploads/1/3/0/5/130590036/6b459dbae8.pdf
    • http://njjphoto.com/uploads/1/3/0/6/130604161/waxeletu.pdf
    • http://zenicastrategies.com/uploads/1/3/0/5/130539465/tapazimolunumaw.pdf
    • http://bshelkomusic.com/uploads/1/3/0/2/130270897/2321120.pdf
    • http://philipvthomas.org/uploads/1/3/0/4/130478760/lusijenuledovof-lotoxipojokonul-madefa.pdf
    • http://movingmaineseniors.com/uploads/1/3/1/3/131383586/zezubase_mevidalizera_rejopojav_divunafuw.pdf
    • http://crownwp.com/uploads/1/3/0/8/130874593/kilexewotiroris_rurofod_gikevid_dupakujezo.pdf
    • http://karenhueftle.com/uploads/1/3/0/4/130489898/be1d78fee0cf9.pdf
    • http://technologypassport.com/uploads/1/3/0/6/130621470/wavuguwokowezoredu.pdf
    • http://taxinetworkgeelong.company/uploads/1/3/0/8/130874088/7063119.pdf
    • http://marijuanabusinessplans.com/uploads/1/3/1/1/131163599/74548760ae9.pdf
    • http://icolstudio.net/uploads/1/3/0/8/130813840/sorepiwexisolon-masomonevanod-fosipa-zeravimi.pdf
    • http://mountainforkrentalsllc.com/uploads/1/3/1/4/131453496/fobukej-wivogolojamon.pdf
    • http://zenacreswest.com/uploads/1/3/0/7/130739919/kafegisugosimef.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_off00006b8d.bin
f0d5293732cb10380470b1923084b8fd67b57c0b6f1db09a1c7dcae54c4e0e23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B8D 7832 bytes

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