Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff0d6dd0c8d8b60…

MALICIOUS

PDF

73.9 KB Created: 2021-03-15 06:08:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 869f92e9c1206091a8c8e66e109acea9 SHA-1: 996c9098d3d84fca9f2a0880dfd38b6f5a7e5890 SHA-256: 3ff0d6dd0c8d8b606982760fb6affd4405b8f32cccb202d17fbcd65142c20c09
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. One of the embedded URLs, 'https://bologen.ru/wix?keyword=free+mp3+music+downloader+apk', indicates a lure for potentially unwanted software. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=free+mp3+music+downloader+apk PDF link annotation
    • http://duvejiwuxikon.getenjoyment.net/82835801110.pdfIn PDF document text
    • http://mozobadijoba.medianewsonline.com/kanger_top_evod_starter_kit_review.pdfIn PDF document text
    • http://gozimudowojuzun.mypressonline.com/jexilomodejojapob.pdfIn PDF document text
    • http://befigter.xyz/72955904918mhv5s.pdfIn PDF document text
    • https://cdn.sqhk.co/rarukaboz/ghVvzjc/retro_music_maker_app.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/tenasolakadukatoparunon.pdfIn PDF document text
    • https://cdn.sqhk.co/gupuwiwi/UAdBjbK/one_more_brick_epic_6.pdfIn PDF document text
    • http://insuranceautousa.com/sosakigufetoxenexupoxowabt7rs.pdfIn PDF document text
    • https://cdn.sqhk.co/koluvukirate/Mk2gjii/bowl_over_wsj_crossword_clue.pdfIn PDF document text
    • http://iclod.tech/581626742809wj43.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/gdnBMvq/15325387492.pdfIn PDF document text
    • http://niburufajanuto.sportsontheweb.net/65894646385.pdfIn PDF document text
    • http://pop-marketplace.ru/42639761377x06cu.pdfIn PDF document text
    • http://respect-ltd.su/9062756975mj5gx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_865035e7f02f4e0e8df1e74fc9a573d3.pdf?index=trueIn PDF document text
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_2d66911ecab54b7582a1722e2f2377e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/lovepususelezisagazegarap.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_1b04bedf164b461da18d4729cc465b17.pdf?index=trueIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_6b4cb6d3be3e44799d182e403185c97e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/android_facebook_login_app_not_setup.pdfIn PDF document text
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_838412a088584a2b9fc150f20dfa32ae.pdf?index=trueIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_c251cc532487492b925cea431b35a65b.pdf?index=trueIn PDF document text
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_1a85d4c3c7f545d5830ba090beeb78af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/iso_31000_certification_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/jolobamafibakavik.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_99b8559ddf5a466b9e72f7f2a85cf6c4.pdf?index=trueIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_a00ddcac5bcc4fc98964b46d6f352920.pdf?index=trueIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_017bd8a569004adb90251f565d929c65.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_off0000e3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C6 5492 bytes
SHA-256: fcfed1314b703af16207dd648f85b01b46bbd08bcffeb6e9815de612c503e0bb
font_01_sfnt_off0000f671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF671 10368 bytes
SHA-256: 65908191cd0d1618593fffbaa881591149ef9a2bcfc5725dc7e9e4a487a9a277