Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1fdc568ef75b1b…

MALICIOUS

PDF

77.5 KB Created: 2021-06-10 15:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f868772b1b7bfc89262af621c6b597c2 SHA-1: e6c616bf920da9d83c0d04b975bada92b12c473d SHA-256: 1c1fdc568ef75b1b2e7d27fac1cd9664467e2cbc66f24ca33766cffd174da0a5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The presence of a 'pubg lite hack version app' in a URL parameter suggests a lure for potentially malicious content. ClamAV and ML heuristics confirm the malicious nature of the PDF, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://wastran.ru/pbw?utm_term=pubg+lite+hack+version+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489838/normal_606693055bc7b.pdfIn PDF document text
    • https://jonolepazom.weebly.com/uploads/1/3/4/5/134520471/8883577.pdfIn PDF document text
    • https://gejiraje.weebly.com/uploads/1/3/2/7/132740564/dewetova_tamazupi_gabeso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408471/normal_5fefa50198ad0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424036/normal_602e43e3b7398.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413702/normal_604d2b1cb0d06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501045/normal_6039d0ec7f7ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462993/normal_606b7739d75bd.pdfIn PDF document text
    • https://rilavowa.weebly.com/uploads/1/3/2/7/132740415/5059642.pdfIn PDF document text
    • https://bimomudunaxa.weebly.com/uploads/1/3/4/7/134757379/konakupol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421040/normal_60229a9022c71.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/a7a7237d-1a63-4dbc-9d4e-130043a4653d/what_is_structural_consensus_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8a82221-397a-4b92-8786-c6fe1f80b72e/blade_and_soul_kr_patch_notes.pdfIn PDF document text
    • http://polubisoxuwo.pbworks.com/w/file/fetch/144498105/21530159667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6119151-5aa6-4a8d-ac08-6abccea5c603/nopazevafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32ac25c5-6b47-405c-9329-d1ab9e4076e8/full_stack_project_with_react_and_spring_boot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afa7edf0-a91d-4456-9927-b9366f17184b/fijufakukawepadipaw.pdfIn PDF document text
    • http://vogituvu.pbworks.com/w/file/fetch/144626652/las_palabras_ms_usadas_en_ingls_traducidas_al_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/314eaef4-8be9-4f86-9cf6-0ddd0f9ccbde/how_to_write_a_story_for_chicken_soup_for_the_soul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2d3f766-a14f-462a-af41-4b05ca7ae682/4906026203.pdfIn PDF document text
    • http://nusometa.pbworks.com/f/ps2_bike_racing_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05777d0d-db2e-4add-8781-1e72db038695/how_to_do_coding_in_grounded_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6abc54-09f8-4389-85af-941fff0a4558/14467709898.pdfIn PDF document text
    • http://gebozuj.pbworks.com/f/mogezivanowovejawodoz.pdfIn 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_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 5460 bytes
SHA-256: ab4701246881807956dce7354d177d851867b310ad4e6c43e3e05fbe287dd493
font_01_sfnt_off00010501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10501 10880 bytes
SHA-256: 56e473b3210003867f3be75ddf9786f5b67758925d78c8d92b3202b72fc6f31c

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