Malicious PDF — malware analysis report

Static analysis result for SHA-256 59aa6b3b6d01a448…

MALICIOUS

PDF

79.7 KB Created: 2021-04-18 13:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9c5eb9b240579dad8f20bd0eb311bfa9 SHA-1: 7bab438774a6e0bf74cbcd362a99aa4e37983a5d SHA-256: 59aa6b3b6d01a44835e7d2c41cba81a76e04c66337f9286dbbe05ca23c47fd64
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's part of a link farm designed for phishing. The document body, though corrupted, combined with the 'SE_MFA_LURE' heuristic, suggests the intent is to trick users into revealing one-time codes or MFA approvals. The embedded URLs point to disposable hosting, further supporting a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://xezojetit.ru/strik?utm_term=how+to+change+the+4+digit+code+on+a+schlage+door+lock PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402944/normal_60329b04d0f3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385009/normal_5fd67d560101a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474478/normal_603c325d9dd38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412999/normal_5fe615a7428fd.pdfIn PDF document text
    • https://nogikukejigili.weebly.com/uploads/1/3/0/8/130873965/6c16fbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456687/normal_6033c8e4be0e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391317/normal_6014a2c7b5021.pdfIn PDF document text
    • https://zezogilak.weebly.com/uploads/1/3/0/8/130874046/8975298.pdfIn PDF document text
    • https://gasipepimajut.weebly.com/uploads/1/3/4/3/134367512/dakabemeraje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484820/normal_600bbd579b4ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/jack_sparrow_lonely_island_piano_sheet_music.pdfIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_cbf34009a0ea45dc8694aeb109ba2211.pdf?index=trueIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_70c5fbe105bd45d6a8beffa06f2bbdcc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/56aa71c1-e2a2-4a00-9392-6db33cd2900f/pudidabuxujufozufak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25459bfd-0009-4d51-ab85-4cab8ca5d705/how_to_control_position_of_dc_motor.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/11908171940.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/sidet.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_670efdc2ae654c5eabd70df37733ada1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9356ccc2-ad56-4a9f-a9ba-f8597ff85d38/44810409624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74b78d61-3d88-4d3f-8da2-201c204fa372/what_size_file_for_poulan_18_chainsaw.pdfIn PDF document text
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_f6526104c04646b5a8efa1f8e140e99d.pdf?index=trueIn PDF document text
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_206778dd7c2e4e31adeacf1809905953.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 5404 bytes
SHA-256: b6bc31cf23ef95526c8bf95c0eba9f7aad948ac1f2e8c8068161c1bf058eba47
font_01_sfnt_off000100ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FF 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0001098c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098C 10944 bytes
SHA-256: e285d03f1b017ef91a9fc539547545b0f95f4f95c0e5a615aa50f6b16bc2a1fc

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