Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6180601125721ec…

MALICIOUS

PDF

88.0 KB Created: 2021-03-16 15:03:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99885ed0c52767e2d113728b88fe584f SHA-1: 43b76ae03557f1a9a9b300d33f5e57436a131db7 SHA-256: b6180601125721ec35c7cefe310e42a391a1744bb8d060cd0767952c001141e2
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to 'dafemum.ru', suggesting a link farm or redirection to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/123?utm_term=canon+eos+5d+mark+iii+manual
    • https://cdn.sqhk.co/fugolamudara/yMidqie/2020.pdf
    • https://cdn.sqhk.co/jobasalem/Ohc56Nd/amc_movies_theater_job_applications.pdf
    • https://cdn.sqhk.co/zasemewiti/eM8GuWa/transference_focused_psychotherapy.pdf
    • https://cdn.sqhk.co/xazururoxe/6yDLx21/horizon_nj_health_claims_phone_number.pdf
    • https://cdn.sqhk.co/gobenebovi/jatTrB5/gangs_of_london_season_1_episode_2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1df69592-ffaf-423d-986a-10281e442329/18138238744.pdf
    • https://s3.amazonaws.com/setikizo/baretorekugig.pdf
    • https://uploads.strikinglycdn.com/files/b7f95f35-2a0b-4737-aa4c-ec16d569c3bd/nietzsche_antichrist_read_online.pdf
    • https://s3.amazonaws.com/wudibirewuduto/manager_interview_questions_and_answers_examples.pdf
    • https://uploads.strikinglycdn.com/files/bce9558f-319c-4fa8-8c1b-e499525eae8c/razer_blackwidow_ultimate_2016_synapse_3.pdf
    • https://uploads.strikinglycdn.com/files/ceeffc05-3735-4b6a-a253-efb72f5c5ffb/35622325684.pdf
    • https://25f35837-e8ad-4357-b490-8f69bec4165a.filesusr.com/ugd/96c61c_0ecc92f406904512a849e4249c07d39b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4bf553d1-26b9-433e-8e2d-199abd592c11/how_to_replace_windows_diy.pdf
    • https://uploads.strikinglycdn.com/files/80ecbea2-f7d4-4a15-b44a-142104ae87d2/sennheiser_rs_180_manual.pdf
    • https://uploads.strikinglycdn.com/files/1f82fba6-0500-449a-b33a-c15951e8c3eb/74334712654.pdf
    • https://s3.amazonaws.com/zagubip/ledaluwinaxodu.pdf
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_3336eaa54bec4d1e9ffb6f51658d3d54.pdf?index=true
    • https://s3.amazonaws.com/boxalewijim/letra_de_la_cancion_stressed_out_en_ingles_itsy_bitsy_spider.pdf
    • https://s3.amazonaws.com/kibavutibeved/thumbnail_cache_files_android.pdf
    • https://uploads.strikinglycdn.com/files/610d646e-91b7-411e-bc05-f5354a536a55/acurite_592txr_temperature__humidity_sensor.pdf
    • https://uploads.strikinglycdn.com/files/a36ac7fa-b7aa-47bc-af21-cfd197398251/98506688297.pdf
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_50c6e331e8fa47a7900913f48e06c5eb.pdf?index=true
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_060ee8675a924e09b8db42871630a6db.pdf?index=true
    • https://3e021c9a-284a-4c54-9ba1-f6d43d4d2ba5.filesusr.com/ugd/a619af_caad5c76716a465b886580692ebbe175.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dba1a372-a598-4b5f-9f76-3efbb211b749/95702093064.pdf
    • https://uploads.strikinglycdn.com/files/35c0364f-2dc0-4f14-97af-f4fb94540454/hp_officejet_j4680_print_cartridge_problem_tri-color.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cfc.bin
2df7fef24619ab48a00867cc1219ec81db3c3b02e27b031b0d814e0f44ab22e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFC 4984 bytes
font_01_sfnt_off00011dd2.bin
44e86e924f224c099445ec62685d7b8def537dd58e4970e14c7b19c352e339ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD2 11280 bytes
font_02_sfnt_off0001444c.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1444C 4324 bytes