Malicious PDF — malware analysis report

Static analysis result for SHA-256 836425218e4bfb1d…

MALICIOUS

PDF

76.8 KB Created: 2021-06-12 19:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b6d3b563111db8bb5845712fab603ccd SHA-1: 03a0ea0ed02db86f262e7a269f3b5d7fb26646b8 SHA-256: 836425218e4bfb1dbbb49d78ad82efe271a395e6215b0f64968f7632cbf6a3ec
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary URL identified is https://smidgel.ru/pbw?utm_term=7+rules+of+subject+verb+agreement, which is likely part of this scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://smidgel.ru/pbw?utm_term=7+rules+of+subject+verb+agreement PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4491173/normal_5fc574cfeb348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426815/normal_603570bf549a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495843/normal_60c4ba5bad9b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392195/normal_6007e2aeee1d7.pdfIn PDF document text
    • https://kumobavubisu.weebly.com/uploads/1/3/0/7/130775432/04751ec07652a08.pdfIn PDF document text
    • https://wetenonuvodipu.weebly.com/uploads/1/3/5/3/135321676/37fb304f10b8.pdfIn PDF document text
    • https://puraxatelodo.weebly.com/uploads/1/3/7/5/137518437/momemejozolo-gamaxinar-rizepujim.pdfIn PDF document text
    • https://fotijaxak.weebly.com/uploads/1/3/4/1/134108731/tejukakenenalaguto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388276/normal_6023b4cfd8ddc.pdfIn PDF document text
    • https://wojagezut.weebly.com/uploads/1/3/0/7/130775605/4d55b82fe57.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/f9fcf009-9393-44be-95e1-6587e4c709a8/mipirilurarajuvilugi.pdfIn PDF document text
    • http://gamanovu.pbworks.com/w/file/fetch/144928242/download_free_infographics_for_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00b262ec-4261-44c0-a796-ba26c108bc05/serenity_prayer_tattoo_rib_cage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76452667-7564-4756-b8d3-7faf4c5dd60f/mind_diet_app.pdfIn PDF document text
    • http://gedelageke.pbworks.com/w/file/fetch/145167198/86301823904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97161aee-63ce-4b20-8828-39cce40abac4/aiou_degree_fees_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c653d2a1-c3c5-42ab-9e50-9f62e1c31430/how_to_achieve_my_goal_of_becoming_a_doctor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e15dc82-f122-4fdb-b9db-29183012bf19/how_to_get_into_mensa_iq.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a078639d-dd8f-4184-be4c-23c5e3dbc72c/how_do_you_connect_beats_solo_3_wireless_to_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38e3fc5f-ef8f-4308-8e2a-205f6994e81c/54896531614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aae660a0-c4c6-40a2-856d-f772eb27ce07/teniwuzukekijutube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9af3fb7-828e-4ef9-a981-9a0fd1f45ce1/tipabajexigonasub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6036d680-8185-466f-af41-020bfc24f083/how_long_does_it_take_to_cook_a_chicken_in_a_ronco_rotisserie.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_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 5460 bytes
SHA-256: bc467c927fb1f97c27b830d6998cdda8c270f85aa5adad6f8b83c38eaf448bbb
font_01_sfnt_off0001005b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005B 11064 bytes
SHA-256: a34603525484f8b6d73b0ea682b334588da6fb3e4d5f4d4bfb345e4e75ceae1f

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