Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e44c1e433bc7448…

MALICIOUS

PDF

149.6 KB Created: 2021-06-10 12:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bbf87e7ccaeaf5c1ff2c9be729941c74 SHA-1: ea28d82036f5320d883a074f5462e3bbf97daa45 SHA-256: 1e44c1e433bc74480eeb98bf15f2e294d17792a68aef4a20eba6e2ad796a7cdd
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a significant portion pointing to disposable hosting and employing UTM parameters, characteristic of phishing or spam campaigns. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to act as a link farm, directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://crewmak.ru/pbw?utm_term=ang+sa+iyo+ay+akin+jan+27 PDF link annotation
    • https://wetugaremuzen.weebly.com/uploads/1/3/5/2/135298520/xaletafopituf.pdfIn PDF document text
    • https://tuvuneboginat.weebly.com/uploads/1/3/1/6/131606819/mituropoduk.pdfIn PDF document text
    • https://webonuru.weebly.com/uploads/1/3/1/4/131437172/20b66beb785.pdfIn PDF document text
    • https://mogomanazeveka.weebly.com/uploads/1/3/0/9/130969503/d689b69cf.pdfIn PDF document text
    • https://kebudojud.weebly.com/uploads/1/3/4/4/134400915/kuzuje.pdfIn PDF document text
    • https://vuvudarekiw.weebly.com/uploads/1/3/4/0/134017261/4178906.pdfIn PDF document text
    • https://rulusekiraz.weebly.com/uploads/1/3/5/3/135322703/1c106c9073f.pdfIn PDF document text
    • https://foxakiletomuxo.weebly.com/uploads/1/3/4/0/134012751/78295.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/7fd009ad-89bf-49a9-97bd-f2ef3044d8aa/motorola_talkabout_t402_frs_gmrs_two-way_radio_4-pack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/578c1fae-daf1-4c2a-a43c-7b2f738fd83e/rusowipowinatomesezi.pdfIn PDF document text
    • http://negaboxa.pbworks.com/w/file/fetch/144930657/straighterline_college_algebra_exam_1_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0f662fb-a429-4cdb-95a9-27a44ec85b74/nojulomeruzodesigige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f1780c2-5e65-4e8e-852b-9c1f7571cfa3/how_to_use_voice_command_on_xfinity_remote.pdfIn PDF document text
    • http://xovelezid.pbworks.com/w/file/fetch/144414552/education_needed_to_become_an_operations_research_analyst.pdfIn PDF document text
    • http://xobapotowi.pbworks.com/w/file/fetch/144928758/download_achyutam_keshavam_song.pdfIn PDF document text
    • http://tezalef.pbworks.com/f/fire_alarm_system_test_report_template.pdfIn PDF document text
    • http://jekijuv.pbworks.com/w/file/fetch/144921027/kya_kool_hain_hum_full_movie_download.pdfIn PDF document text
    • http://fotowefufet.pbworks.com/w/file/fetch/144913701/bernoullis_apparatus_lab_manual.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/w/file/fetch/144598626/60267758601.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/w/file/fetch/144676956/99741486589.pdfIn PDF document text
    • http://kiwuwas.pbworks.com/f/what_are_some_negative_character_traits_of_odysseus.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/to_kill_a_mockingbird_audiobook_chapter_4_and_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1bd2625-e821-4af0-b3b6-d3edcd669bf0/waterboss_900_review.pdfIn PDF document text
    • http://zabodovojif.pbworks.com/f/the_interview_1998_explained_reddit.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_off00020e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E58 5168 bytes
SHA-256: 54d0a9cb94741ba1cde1088bd9e38ab56c49d8a2aa3d462499db09238c55bee4
font_01_sfnt_off00022026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22026 11488 bytes
SHA-256: ae1b2da4a872435b9082e85d354519571b8503f76daa792afb68a06215729b69