Malicious PDF — malware analysis report

Static analysis result for SHA-256 022dea76ec45bc95…

MALICIOUS

PDF

78.9 KB Created: 2021-03-07 12:56:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6b3790fce5b6e26b2b09f441e835a85d SHA-1: 9714aeff4f10eebcc8690063e193c5feff7bfe6e SHA-256: 022dea76ec45bc956f08c36a2c3b96bfd3382767c36a3c90aac73f1445a89f68
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=remove+ocr+from+pdf+online PDF link annotation
    • https://cdn.sqhk.co/tamejenonisi/ffE6gdE/panazumadirepukeg.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/Mlhacic/tangled_the_series_season_3_episode_11.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/jqz7clh/zinatazom.pdfIn PDF document text
    • https://cdn.sqhk.co/mobixipotex/gefijjc/awesome_tanks_2_level_editor_cool_math.pdfIn PDF document text
    • https://rufevefiwavanu.weebly.com/uploads/1/3/5/9/135992343/fegivunizus.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/LicgjCf/weather_underground_seattle.pdfIn PDF document text
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/tolowexenowaduwa.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/ughibgc/how_to_find_my_best_hair_color.pdfIn PDF document text
    • https://zegasapazenavu.weebly.com/uploads/1/3/5/3/135326880/pileguwubutipo-panobuvifizoraf-kojaxolovi-paguzuxo.pdfIn PDF document text
    • https://sajofagexureleb.weebly.com/uploads/1/3/4/6/134652103/dizusokatelus-ranoxedunokiga-nazolemowa.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/ci3jcie/zutevox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xasonivuk.epizy.com/chemistry_structure_and_properties_2nd_edition_free_download.pdfIn PDF document text
    • http://mujusitajal.rf.gd/48147807056.pdfIn PDF document text
    • http://vinixozu.rf.gd/what_is_the_top_speed_of_a_2015_mustang_gt.pdfIn PDF document text
    • http://kafuvaxuxele.epizy.com/zogavunuvigaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a829d151-47d8-48d4-ac7e-f750f0409e1f/how_to_fix_a_leaky_delta_jacuzzi_faucet.pdfIn PDF document text
    • http://mirabawuwoku.epizy.com/guseruwixevumadoxude.pdfIn PDF document text
    • http://jevusavisa.epizy.com/59592949951.pdfIn PDF document text
    • http://vekujekodabudu.epizy.com/cherokee_workwear_size_guide.pdfIn PDF document text
    • http://jajunoz.rf.gd/video_bts_idol_dance_practice_planetlagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d837de9-2d57-4a3f-95ba-597704b021c6/61548599571.pdfIn PDF document text
    • http://zobovobewuw.epizy.com/flour_machine_project_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff647e1d-808d-470d-abf2-eeaa31dc547d/57941725018.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA83 4688 bytes
SHA-256: 28880e4c62528caa85c28a4d7baaf0e2dc5b30e292f774d909ab11f6d446ea38
font_01_sfnt_off0000fa54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA54 11072 bytes
SHA-256: ba84c7a4e832f2eb6486605dbe5a8fb8f9b719040122e682612dab377b48f6c3
font_02_sfnt_off00012033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12033 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f