Malicious PDF — malware analysis report

Static analysis result for SHA-256 981e790c3f1919d8…

MALICIOUS

PDF

74.0 KB Created: 2021-03-07 15:35:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fd35977ab14457004144c558fca06227 SHA-1: b678bb239269ae9ddb15ded5272c31a78621659c SHA-256: 981e790c3f1919d89668e380669657eaaa1d4da754cbf8d3f6dcaff29ce4d285
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, and one suspicious URL related to 'ms project 2019 tutorial pdf'. ClamAV and ML heuristics identify this as a phishing or malicious PDF. The presence of embedded URLs and the link farm structure strongly suggest an attempt to redirect users to malicious sites for further compromise.

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://gimoguvi.ru/strik?utm_term=ms+project+2019+tutorial+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387060/normal_5fe1c9ab86307.pdfIn PDF document text
    • https://vasaxufunibax.weebly.com/uploads/1/3/1/6/131606743/7129812.pdfIn PDF document text
    • http://kellys.space/tabletopia_steam_loginz617i.pdfIn PDF document text
    • https://cdn.sqhk.co/damukowabij/xhjohcB/pdf_document_scanner_ape_apps.pdfIn PDF document text
    • https://kefozonijufan.weebly.com/uploads/1/3/4/6/134689321/zamapu-xivufovo-bixujerapap-zesev.pdfIn PDF document text
    • https://bixedonaxube.weebly.com/uploads/1/3/4/6/134619794/berad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_5fe8eb601f05b.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/haLbWha/radio_kiss_fm_online_live_romania.pdfIn PDF document text
    • https://lixemuvoxowogod.weebly.com/uploads/1/3/4/8/134878154/72deafcb.pdfIn PDF document text
    • http://klokisik.space/xijometevupobogevjid4i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474169/normal_5fe58ec0749e8.pdfIn PDF document text
    • https://kadamoxezegawuf.weebly.com/uploads/1/3/4/3/134347408/notalezudo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418970/normal_6017263844163.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/pelipuwubegoruxeduga2m2p.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/Mngdgih/wupus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_b7b7653678fa4290ae835550cd5287a9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bffcb90-fd9b-4462-88f5-a50295ae558d/42888000381.pdfIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_9d56e29e42e1437696d59305f6c4d14a.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_10967fa31a504f2998668d46347371bb.pdf?index=trueIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_64374e20eda844bab8fbd9e2bec2dcbd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/513e94be-cbc2-4d65-9bd1-74270e13262f/can_you_mortgage_property_in_monopoly_to_buy_property.pdfIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_62f3f4086acf493990bdf893e1ef55b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e989a729-d2d8-4c1c-86d8-e423fbf49d73/brownells_-_ar-15_m16_upper_receiver_lapping_tool.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_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 5712 bytes
SHA-256: bfc7482d73661d8cab11a8681c78da54244097e39c10113ffa833443375b8968
font_01_sfnt_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 10760 bytes
SHA-256: 33b4f559b35ba178d9ab38d086e39f119819d4bc5b4d6d4a41658b63b1a7de80