Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fa7446e0c7e636…

MALICIOUS

PDF

66.7 KB Created: 2021-03-15 11:16:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: fcfb75dcc67431b02270abe705341f13 SHA-1: b08d82cc9a2fa9182e82a03c31c2cf7b95201a38 SHA-256: b6fa7446e0c7e636920f7f919c1689bc349e666c318a0cd25513deb3d178444f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with at least one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of a link farm suggests an attempt to manipulate search engine results or direct users to malicious sites, likely as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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 https://crophysi.ru/wix?keyword=8.2+cell+growth+and+reproduction+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4402507/normal_604edcec8f5b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_5fe861995c094.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379736/normal_600323348b513.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392191/normal_5ff2af0187ae9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376086/normal_602823d5ef5b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_60478dae18421.pdfIn PDF document text
    • http://cheatyou.site/89688398399t6su1.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/73465449787p8l63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384150/normal_60028a300783b.pdfIn PDF document text
    • http://dkmz1.club/limukigifedilol4u1q4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_f61c28927c5d4e028a5b0e28e10332c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/filmii_afaan_oromo.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/75704005661.pdfIn PDF document text
    • https://166fd6fc-b342-4bd2-abbb-a58a2e42959b.filesusr.com/ugd/b56239_4736fa5789934a199c2b7746ee69c713.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/nadiwoparugovorudikew.pdfIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_3803eae3f6e845fb9f6b638b6542a0cb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/fresh_air_by_ecoquest_filter.pdfIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_fb0837a92243442595cdfb5540b72f9d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/wilimojeworafax.pdfIn PDF document text
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_b7851f0b073d471f84a8758059579417.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C5 5856 bytes
SHA-256: 94a2846476edef45f24341bd9242db4a25e537b0914643cd9cdca8151e935559
font_01_sfnt_off0000dbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 9908 bytes
SHA-256: 0fd0041dc0d5fb0166e44991ac9e20c4021e812a4d6861b937e6460b5a69e19c

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