Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3053525c37d33c…

MALICIOUS

PDF

83.9 KB Created: 2021-03-09 22:12:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9925bfcee3ae7fe65388b49a0432965 SHA-1: 77b81c78be9955eec2f32b9326842ff9aeec71de SHA-256: fa3053525c37d33c9dbe50fdcec6586ba69db4189dcb4574e0b8d5c82f80aac4
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers flagged this as malicious, specifically a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://jumiwimov.ru/123?utm_term=your+answer+place+summer+reading
    • http://lixorajepidil.mygamesonline.org/f_table_0.05.pdf
    • http://dazolovegom.mygamesonline.org/xobenovefurivalijuju.pdf
    • http://fanutoragozogow.sportsontheweb.net/what_causes_a_dishwasher_to_not_clean_well.pdf
    • https://cdn-cms.f-static.net/uploads/4494668/normal_6015b1b345e98.pdf
    • https://static.s123-cdn-static.com/uploads/4402706/normal_5fe14674e91f4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vexolofifete.atwebpages.com/rugupiluf.pdf
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_5379c459e20e4cf4966957b78b286768.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3b3447ae-df6e-4607-92b1-6b15ab0e0348/how_much_do_sandwich_bags_weigh.pdf
    • https://uploads.strikinglycdn.com/files/81a291d4-aa17-4403-b96b-63da29d62edf/61991152435.pdf
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_f30b99a670db4925881d9f7e1634f45a.pdf?index=true
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_25e54bb6e91d43d6be3577eacb0eca65.pdf?index=true
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_d6c1292aefe44fedbbb865e98e7ba449.pdf?index=true
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_8f308f5331d84f0cbf0e7aa9c1a0a9c0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9a99f260-c5f7-4e19-8041-f0e09ce11d0b/lauren_oliver_delirium_book_4.pdf
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_ef3ac6900adc490481545af5df6cfc73.pdf?index=true
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_efb977aa684c4e7f8a8f2b96d9e1465a.pdf?index=true
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_f2402018f57f44e19f427ba428ce7e67.pdf?index=true
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_1cf55576d2ca4d2dbbbbe2bfab5e01ec.pdf?index=true
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_e3ba780aab1146f89a184d13e1c76336.pdf?index=true
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f07b.bin
8a5f67dcab16b458ff35f781d0cf6fb62ac86d1e2b03bd17f9f62721a036203b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF07B 7068 bytes
font_01_sfnt_off00010823.bin
f3d547477c0e2012896a154990514d127a1f8875ece1ac5fe6d0f7e48350d5de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 5448 bytes
font_02_sfnt_off00011aa6.bin
c96e10c65395503f599ffada040bdf16e198e400d447ebea78b88248e95f1c4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA6 11524 bytes

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