Malicious PDF — malware analysis report

Static analysis result for SHA-256 826ca8b1d436cb0f…

MALICIOUS

PDF

72.8 KB Created: 2021-05-17 23:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 488ad5a74bacfe6c2d9a9cd034d33c41 SHA-1: 0ac92a6dd4a6053b8962677a2cbdf2960a34ee52 SHA-256: 826ca8b1d436cb0fd59fdec87752deef71d1af7f94ddff4bdae64b2ba0be59e5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary link to 'lozipotod.ru' which is part of a link farm on disposable hosting. This suggests a phishing or redirection attempt, likely to deliver a secondary payload or lead the user to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/strik?utm_term=how+thick+is+corrugated+metal PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408701/normal_60445b6174f45.pdfIn PDF document text
    • http://faxadiweruxu.22web.org/death_note_anime_netflix_country.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386837/normal_5fe6bc3aa3427.pdfIn PDF document text
    • http://vagesibakizame.iblogger.org/capacitive_transducer_nptel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496165/normal_5fe15e37b65aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381321/normal_5ff6a1ddb14c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_5fd309d404014.pdfIn PDF document text
    • http://govorudoxamelap.22web.org/fuminopetizedorolaxixegik.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/1e53d5cb-3922-4dee-a1a7-d95dd5805ee9/90910956830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d5bdd25-b8fa-4dbb-8d5c-fa1c052dffc7/butorakeruxebogijolodo.pdfIn PDF document text
    • http://pubofemitepe.rf.gd/penggolongan_antasida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50bb0581-ee05-4bd2-81ad-0c830db48b43/the_man_in_the_high_castle_season_3_trailer_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00127b80-2abd-4b2c-9aab-9f7380a19e9c/lazutov.pdfIn PDF document text
    • http://faganelatoke.epizy.com/sesumogujodasulepaxuwaw.pdfIn PDF document text
    • http://gelotamarabi.epizy.com/10th_class_science_question_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7f5b30b-9547-4b03-92c1-e51934f185a0/vonurudidesitutakutowaj.pdfIn PDF document text
    • http://wemiwapava.epizy.com/79205951270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c258bdf-b74a-4d53-838a-011a81365518/the_twilight_saga_the_official_illustrated_guide_read_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2d4aff9-7f0f-493c-b5a7-cc1d18a7a53f/focusrite_scarlett_solo_2nd_gen_buffer_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e51963cf-d12d-4ea4-85ac-ce3fd7d176c6/how_do_i_connect_to_my_verizon_jetpack_4g_lte.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20951ad7-1a72-4501-96f4-8e0f30d6c96f/tolugusedax.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_off0000de5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5A 5468 bytes
SHA-256: e6e09311d42f018f9975b92603173879dcb7021369b64071d44f3009791c4bf9
font_01_sfnt_off0000f0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DB 10400 bytes
SHA-256: 7a096d84ca971efbf6991b3de2defc25e2f03b99b27a1ef055658f62e279d472

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