Malicious PDF — malware analysis report

Static analysis result for SHA-256 676c17f947c9320b…

MALICIOUS

PDF

78.4 KB Created: 2021-03-21 01:17:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 087a273ed130d3b321e2ae09cd5fc731 SHA-1: 4eb4c1c2d3ed284c72f796e326f0151a64a4a461 SHA-256: 676c17f947c9320b1154086a657d64f32864b568bb7736874fe1a3cc90eb67f4
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and flagged as part of a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to engine parts, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of multiple malicious URLs points to an attempt to redirect the user to harmful content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=8+hp+briggs+and+stratton+vertical+shaft+engine+carburetor In PDF document text
    • http://topcabinets.xyz/jiludafuvoc0mpb.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/99373369913.pdfIn PDF document text
    • https://furureseseruwa.weebly.com/uploads/1/3/4/4/134481841/pujusefifa-fivigosuwox-tivas-lifigazaxinojin.pdfIn PDF document text
    • https://susokeruno.weebly.com/uploads/1/3/4/6/134656617/xufojobowixov_tajaduvasusuje_ganeruk_takuzululodomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_603a843a65d18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454977/normal_60567aa9c8ebc.pdfIn PDF document text
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/8098676.pdfIn PDF document text
    • http://lapegokexixij.medianewsonline.com/gulejaxijakekijegexeleku.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/how_to_start_a_fiction_short_story.pdfIn PDF document text
    • https://fegajasun.weebly.com/uploads/1/3/4/5/134502742/noxizivapuk_vigenulodotijez_zanevosuso.pdfIn PDF document text
    • http://chaptejvxz.fun/best_rated_10000_watt_generatorj9y24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484639/normal_60140ade6d3c0.pdfIn PDF document text
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/mibafipafe_jikep_tiputipufedalo_venigatepu.pdfIn PDF document text
    • http://just-gopro.com/sylvia_day_one_with_you_audiobookd5tex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505102/normal_5ff805a41897c.pdfIn PDF document text
    • http://de-bewertung-889562.icu/kiwusexeduxapusaxafinejee18k6.pdfIn PDF document text
    • http://salonlabs.xyz/jump_force_dlc_season_2_characters_release_dategy9we.pdfIn PDF document text
    • http://jesawukimefix.mypressonline.com/nozebepefipin.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
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_6e709336fac3463a9c1fbbbd58d6bcbe.pdf?index=trueIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_e7a745126dde49279faeb5e173438f30.pdf?index=trueIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_4fd53cbff7184daea37baf2f6236539d.pdf?index=trueIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_79967c38ff7b45ff8e8ed459c2e315a7.pdf?index=trueIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_b2b7027e3a924bba9bb216c489975dc0.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_off0000e666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 5596 bytes
SHA-256: aa62ad94f234f5e6f09c4073511e8849451ea4c41394c742111c8cac8f02ba55
font_01_sfnt_off0000f962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF962 10588 bytes
SHA-256: 9c4635fde8d585a49f0dcef63af6484f27029b8acd6863e42f317319eb879dc8
font_02_sfnt_off00011d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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