Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e41dfb863437ce0…

MALICIOUS

PDF

74.8 KB Created: 2021-03-08 18:47:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fe4f848f721ceaa13b4b1312268f6b20 SHA-1: 518732b3ef2d3a7b2c52264bd27e0eeef370f684 SHA-256: 9e41dfb863437ce0d12402debb1af51be6d292a99ef214f20e672edc536562ed
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kuzutuzo.ru/wix?keyword=jvc+kw-av61+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373755/normal_602739c42ec1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382789/normal_5ff5f5c09b4fa.pdfIn PDF document text
    • https://magajasomit.weebly.com/uploads/1/3/5/3/135388043/c0ab43df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5fd7491a37b17.pdfIn PDF document text
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/mebuviko_tojopuxib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474734/normal_5fc80dafd4bfb.pdfIn PDF document text
    • https://pexekakuxop.weebly.com/uploads/1/3/2/8/132814074/7917d8.pdfIn PDF document text
    • https://suwodofiwimi.weebly.com/uploads/1/3/4/4/134495338/8570c5771ef.pdfIn PDF document text
    • https://jizetexosobuwek.weebly.com/uploads/1/3/0/7/130740437/ruvexanijexanim.pdfIn PDF document text
    • http://findssldz.xyz/xomarudijijiguxavexuvumef2g38.pdfIn PDF document text
    • http://save50.pro/34578267121t8vvn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490001/normal_60014417d59dc.pdfIn PDF document text
    • http://nefuzixitelu.iblogger.org/47418428619.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/d13f8357-31d6-4409-a03f-e28cb161ab6a/jidipevuzitezubikuf.pdfIn PDF document text
    • http://fositelorefux.epizy.com/fibote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3028aa-00ee-4045-9c51-fdae5bf8792d/28910808760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09168ddc-6ea4-4c80-a739-9972c914cd07/honeywell_electronic_air_cleaner_filter_installation.pdfIn PDF document text
    • http://xinudekewukipi.rf.gd/garmin_vivofit_4_fitness_tracker_best_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccb404a3-07c4-4aad-a1ab-6100cf52472c/dazurojizamew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44464c82-43a4-4911-8374-df546875fa7e/dyson_dc41_instructions.pdfIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_189d5b63f4a24c1fbef6fdbc9fdcee54.pdf?index=trueIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_afb2690d03874c45a62e57e329d2b773.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CE 5116 bytes
SHA-256: 0c4e13835ebf291a9fa2d35b68fef4c553f772ddefc6be338959e26b655e448f
font_01_sfnt_off0000e453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE453 10468 bytes
SHA-256: 7ae0f34992921abcdab6ab4b9c01a6c8657658bc934b76463c0c60f683c610a5
font_02_sfnt_off00010826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 16248 bytes
SHA-256: fbeccb1482ee56052ed809ec6cb7dfbc577d51b9212e43fffabc93e29761b6bf