Malicious PDF — malware analysis report

Static analysis result for SHA-256 943c68ce4bcc0ec0…

MALICIOUS

PDF

80.8 KB Created: 2021-05-30 22:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f12df06234727a7978192cb5d4505b1 SHA-1: e20067d2a7cbc7e32cd89a850ec1c1a1825d7e47 SHA-256: 943c68ce4bcc0ec08b5ba3037da80f76414ea21bc72c3fe1b41ad2451ecb9f6b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in link farm attacks to manipulate search engine results or to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=how+to+reduce+pdf+file+size+online+below+2mb
    • https://bosizeke.weebly.com/uploads/1/3/4/5/134596703/8aa353b607de0.pdf
    • https://cdn-cms.f-static.net/uploads/4448116/normal_603eef7c490bc.pdf
    • https://static.s123-cdn-static-d.com/uploads/4464083/normal_60b09fd5c691c.pdf
    • https://cdn-cms.f-static.net/uploads/4413244/normal_602c393c08ef2.pdf
    • https://cdn-cms.f-static.net/uploads/4450634/normal_602a461b8397f.pdf
    • https://cdn-cms.f-static.net/uploads/4409257/normal_5fd315622f0ad.pdf
    • https://cdn-cms.f-static.net/uploads/4385634/normal_600c9bc5b3c29.pdf
    • https://befadileniralan.weebly.com/uploads/1/3/6/0/136082268/96b4c9558.pdf
    • https://kuxokovu.weebly.com/uploads/1/3/0/7/130738635/xowadu.pdf
    • https://cdn-cms.f-static.net/uploads/4385427/normal_5feaf6c1249e9.pdf
    • https://vajawopi.weebly.com/uploads/1/3/4/5/134597817/fafak.pdf
    • https://lorolefe.weebly.com/uploads/1/3/1/8/131871725/2155660.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d873490b-392c-430a-9e3a-199b30c50697/fubud.pdf
    • https://uploads.strikinglycdn.com/files/91d35b27-831d-4585-8f79-0c144a8c0d96/40245836745.pdf
    • https://uploads.strikinglycdn.com/files/8761b4b1-09ac-4863-a7c9-a0bf3fec4cdf/what_is_the_wps_button_on_my_bt_router.pdf
    • https://uploads.strikinglycdn.com/files/135113ba-19ae-43e5-9757-94182e7ee103/67501469200.pdf
    • https://uploads.strikinglycdn.com/files/93349e18-4b79-4720-ad54-0c26ce0afb12/finnegans_wake_restaurant.pdf
    • https://uploads.strikinglycdn.com/files/4584ebc7-9b07-46ed-bbc3-d0eb7180e629/49669022170.pdf
    • https://uploads.strikinglycdn.com/files/f7e4c56a-3d0b-4986-a824-9a84dae9fcc9/pillars_of_eternity_guidebook_download.pdf
    • https://uploads.strikinglycdn.com/files/9f5b90fe-213c-40e3-9fe7-b1341c5decda/bexavofarevitovozubirup.pdf
    • https://uploads.strikinglycdn.com/files/6810a9ae-f475-4276-a869-b3db8d06751e/kalujukumori.pdf
    • https://uploads.strikinglycdn.com/files/765ad140-092b-4825-b534-30e0bbfe9acc/gate_computer_science_and_information_technology_2020.pdf
    • 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_off0000f0ab.bin
83c08a363f804dbe48a20233176f9bd55d5a474e83f0bbb2bf32907ae3cbaa39
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 5348 bytes
font_01_sfnt_off000102da.bin
559f18f950c5b229e7f0b1d4c4515a0905278d005b18fd4ec29e358a01a550c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 10580 bytes
font_02_sfnt_off000126ff.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x126FF 4324 bytes