Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f25ee32c3f73f8…

MALICIOUS

PDF

91.6 KB Created: 2021-04-23 23:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d7e9b613dca2f4abcf0bfadcc9d36c28 SHA-1: 51342489ec4345b8aaaff48a257bfaedd62fc931 SHA-256: e5f25ee32c3f73f84c2f379ac67312077cec9c08aa199b44fe1d85b4d031da78
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://pelibifir.ru/strik?utm_term=how+to+explain+your+philosophy+of+life PDF link annotation
    • https://cdn.sqhk.co/tajixixejafi/R3Fie4g/kasujewajewabexe.pdfIn PDF document text
    • http://tikanaw.mypressonline.com/sex_and_the_city_drama_queens_cast.pdfIn PDF document text
    • https://viweruvuwoloti.weebly.com/uploads/1/3/4/5/134577653/dixovezotinesolavale.pdfIn PDF document text
    • https://kimakinogi.weebly.com/uploads/1/3/0/7/130775446/9172802.pdfIn PDF document text
    • https://wuriwodek.weebly.com/uploads/1/3/4/6/134688082/kojikomukoxerat.pdfIn PDF document text
    • https://cdn.sqhk.co/genonitag/jdGrVv2/defender_car_price_in_nepal.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/loxobom.pdfIn PDF document text
    • https://cdn.sqhk.co/gegatuzikat/Tb9hggZ/29107922937.pdfIn PDF document text
    • http://fosonelotila.medianewsonline.com/graphic_anatomy_2_atelier_bow_wow.pdfIn PDF document text
    • https://cdn.sqhk.co/mugetawelumi/GGBTOia/11803944795.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/Zn0Mdkh/frozen_general_tso_chicken_air_fryer.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/85284b1f-d63e-4bcb-88e7-13a66e3c892a/what_is_rule_based_ethical_reasoning.pdfIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_f0404048b8a8436280153a68201d72ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tevigotu/birdland_weather_report_sheet_music_bass.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/brakebest_brake_caliper_guide_pin_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df03b4d0-e578-44a4-8fb9-d5e041c9a734/71796911708.pdfIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_28bcb4daa5b0490ca104d00025f8469e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/k._e._m_road_full_form_bikaner.pdfIn PDF document text
    • http://memamawu.onlinewebshop.net/17645256821.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/sunbeam_mixmaster_heritage_series_2353_replacement_beaters.pdfIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_fe1ed8f413b345e8a1cf49d2a77b480d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/61268311373.pdfIn PDF document text
    • https://62619d47-812b-4c4f-a232-aa08d86264e8.filesusr.com/ugd/6d62c1_500efe34692d4d3b9547f8325aa4b9a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf420ba-822e-4987-bd1e-62ceb8bd2782/koruzimusaloti.pdfIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_4e42212d9bdd4fff8c154c86b1489165.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC0 5212 bytes
SHA-256: 318994bd8654c330290bb4d700828fc24eb7a622c8f1ea90d9f1e1b3dcfe0522
font_01_sfnt_off0001218c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218C 11516 bytes
SHA-256: b93c693a05331e5ddda8bd134267b9a26894880f8d5ac44ab927453f20736962
font_02_sfnt_off0001491e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491E 16632 bytes
SHA-256: 2271f40f8aad40e7e8a6f835831dad22056d62c54c1e223a731df4ff6c0c3719