Malicious PDF — malware analysis report

Static analysis result for SHA-256 381a41356ad318eb…

MALICIOUS

PDF

76.0 KB Created: 2021-03-14 13:55:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 0e05531f5422c6bc87e38247b302617c SHA-1: dab4353b3354fa704426a764077231037e3debcb SHA-256: 381a41356ad318eba09ab74bf7449d09acbb5e5140170aa27264f56ad327c0a6
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary URL, https://mezovuduw.ru/award?keyword=amines+neet+questions+pdf, indicates a lure related to exam preparation materials. No scripts were extracted, but the PDF structure itself facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://mezovuduw.ru/award?keyword=amines+neet+questions+pdf PDF link annotation
    • https://cdn.sqhk.co/nozelenid/hficnBI/orange_tree_buy_uk.pdfIn PDF document text
    • http://dobewobezusisof.iblogger.org/zujezewabawumevef.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/QgexMNM/91514219615.pdfIn PDF document text
    • https://cdn.sqhk.co/fotenulutis/aia1jeE/goa_naval_area_driver_recruitment.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490725/normal_6012db5cc7d7b.pdfIn PDF document text
    • http://popekoze.iblogger.org/nulozujaburar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380237/normal_60038fe8c111c.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/frhdAgc/nuzorakanaweloletixavuzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415783/normal_6020f9577ac82.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f4f91cb-58dc-4c16-97ba-c430b8110dee/81395909515.pdfIn PDF document text
    • http://lebigegapil.epizy.com/73563379633.pdfIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_f8dc44d1a47945c1a69827ec16576f1b.pdf?index=trueIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_433223f34e8b47f9a0d0ed5f565621e2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a3aca61-8e2a-4b47-8341-821beada0d6b/how_do_you_find_your_subnet_mask_and_gateway.pdfIn PDF document text
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_0b544bcd3312426ebf0017d209d2bf65.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_c0bee3dd11b2441a860e151781c4940e.pdf?index=trueIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_a7f3e939ebe54a38a81da4a3c8ba70b2.pdf?index=trueIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_60a1018d57b745079eb4f369523fc3d3.pdf?index=trueIn PDF document text
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_e2e34612395142609e38842cdc941000.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4f71c7d-96b1-4891-a1a3-8e21532d6f94/toro_recycler_lawn_mower_22_front_drive.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_13bc72e3c77b4bae86b66e8b3b7d035f.pdf?index=trueIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_66677d76e3854f3dba37576e00a4abf5.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_off0000e8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D6 4964 bytes
SHA-256: d00e68e36b4c8d4e3bff4733a384e6d8e0890768b8f514b01416175b6f350708
font_01_sfnt_off0000f9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B1 11596 bytes
SHA-256: 4691ac18977364619252577b8331b0e18733341a4ffb345925fc8303672f9777