Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5885ccae60c5da…

MALICIOUS

PDF

88.7 KB Created: 2021-04-15 09:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2086d37bc18d11334b02aa806fa89b7d SHA-1: 211f9656dc67d074289315d117508a5dcdac55bd SHA-256: 6d5885ccae60c5da87749f9205cacad183bd92f9fc37df1b9638cff99b1e7cef
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on directing users to a suspicious domain ('pelibifir.ru') that is flagged as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further suggesting malicious intent. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate this PDF is designed for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=zero+belly+smoothies+reviews
    • https://cdn-cms.f-static.net/uploads/4418987/normal_5fdb85a5ee556.pdf
    • https://cdn.sqhk.co/pomodizad/jdvhhRB/josiburosu.pdf
    • https://cdn.sqhk.co/limizolaxa/eyjiGuO/lazanomug.pdf
    • http://gezijipomolu.iblogger.org/22859381478.pdf
    • http://kefagotijuxe.iblogger.org/fasupaxuwo.pdf
    • https://cdn.sqhk.co/xomakonezema/0iaUgif/crossword_solver_imaginary_kingdom.pdf
    • https://cdn.sqhk.co/zanivuwiduvo/jbeCWjc/idle_trains_empire_mod.pdf
    • https://static.s123-cdn-static.com/uploads/4482399/normal_5ffff297a6036.pdf
    • https://static.s123-cdn-static.com/uploads/4420747/normal_5fe3424f4436f.pdf
    • https://static.s123-cdn-static.com/uploads/4405654/normal_5fc56db320401.pdf
    • http://sumovenelexefik.iblogger.org/95505246883.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jerolap.rf.gd/meloxakusufa.pdf
    • https://uploads.strikinglycdn.com/files/61b7768d-65b8-4f69-a315-f40db41fa77a/is_zmodo_app_free.pdf
    • http://telatojewoka.epizy.com/tabijijefepufunamexib.pdf
    • https://s3.amazonaws.com/fedure/mortal_instruments_city_of_bones_full_movie_english.pdf
    • http://gorulilul.rf.gd/wozetamivakixemowebosego.pdf
    • http://bipaxoxibiva.rf.gd/plant_systematics_book_download.pdf
    • http://sixekefem.rf.gd/anoxia_del_recien_nacido.pdf
    • https://s3.amazonaws.com/dagasopones/56193253448.pdf
    • https://uploads.strikinglycdn.com/files/8dbeafd8-fa9d-43ea-88b5-0f9e1e3faa7c/lovedejelozekubifepawol.pdf
    • http://zarufutebere.epizy.com/gemefitajodepemazalixiv.pdf
    • https://s3.amazonaws.com/guwutivupudutu/fundamentals_of_industrial_hygiene_6th_edition.pdf
    • https://uploads.strikinglycdn.com/files/98b3ec82-5580-4901-9cb5-d08ff64b40d9/13652312905.pdf
    • https://s3.amazonaws.com/gedesisumi/75146593863.pdf
    • http://jusaxokipumata.rf.gd/vuzozazejenu.pdf
    • https://uploads.strikinglycdn.com/files/57bc1b3a-cf0e-4267-92d5-8168368d2b04/8621042545.pdf
    • https://uploads.strikinglycdn.com/files/2712de4f-d446-4855-9c69-0eccbf1c0d5e/network_security_through_data_analysis_from_data_to_action_2nd_edition.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010573.bin
b469ce344eb64d7f0b792fa643094627fac6b6efa7e0e57b1912a6dc2522fa9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10573 5064 bytes
font_01_sfnt_off0001169b.bin
fc7b0dfcdc4b5b7e05611bd3dde833575f07c05875a5155ca28cee7910eadae6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1169B 11628 bytes
font_02_sfnt_off00013e6f.bin
4f6d6443d667672870c38ce4e1d364e29e61a0df6fd2d8217a47270b9fff04c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6F 16132 bytes

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