Malicious PDF — malware analysis report

Static analysis result for SHA-256 5279cf17a820ae52…

MALICIOUS

PDF

85.9 KB Created: 2021-04-11 21:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d7212ce37e6990419f08ab99f1615756 SHA-1: c09eab06f6d007a81c5d0d85bfb1df1f1b28777e SHA-256: 5279cf17a820ae52af048421c325ad8334201c1064c59887985ae9fbcad4d23d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains keywords related to a Craftsman snow blower manual, likely a lure to entice users to click on the malicious links. The presence of ClamAV detection and ML flagging further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=craftsman+21+inch+snow+blower+179cc+manual PDF link annotation
    • https://cdn.sqhk.co/vokipidelad/M9hhD2r/midiloribegetapogegujajab.pdfIn PDF document text
    • https://kexazupaxi.weebly.com/uploads/1/3/3/9/133997339/9707292.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416493/normal_5fe2ca9e25d3c.pdfIn PDF document text
    • https://cdn.sqhk.co/soziwariru/gu50ial/berry_smoothie_recipe_my_cafe.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/jdwpkqm/train_or_taxi_from_sydney_airport_to_wollongong.pdfIn PDF document text
    • https://vadewowiruku.weebly.com/uploads/1/3/1/3/131382700/zekawusifotek-ditadi-kivosogalal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404755/normal_5fe435b7920ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478125/normal_6038cbd3e6147.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/hjhbhja/cossacks_game_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fikalibumi/hkiche6/load_balancer_terraform_aws.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/jhNzQXc/creepypasta_minecraft_skin_net.pdfIn PDF document text
    • https://cdn.sqhk.co/lunexubafexo/3jdlhh3/ad_free_call_blocker_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/jcifWHl/how_many_boats_in_sea_battle_game_pigeon.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/business_plan_for_online_shopping_website.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/ehhhhih/20447048234.pdfIn PDF document text
    • https://cdn.sqhk.co/mebosuxular/jgiagjb/2_player_skeleton_battleship.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_602a2f21b4826.pdfIn PDF document text
    • https://jobekivisa.weebly.com/uploads/1/3/4/5/134584889/pumebosip.pdfIn PDF document text
    • http://mujubow.getenjoyment.net/absceso_hepatico_tratamiento_2020.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/how_old_is_google_maps_street_view.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off000101a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 5676 bytes
SHA-256: 4d9f1ee3a4147febb97b5cf1373e5026b991ef77d4e89a4c505a006b42c00c91
font_01_sfnt_off000114dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DD 11120 bytes
SHA-256: d646928864e98b5d728edb8f515942b979b8fe07344e5cb3062978dcd046e646
font_02_sfnt_off00013a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A85 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176