Malicious PDF — malware analysis report

Static analysis result for SHA-256 de34d0b5125b0e6e…

MALICIOUS

PDF

78.7 KB Created: 2021-04-22 19:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: baf0eaf38c918443f50b2c538a31d4b1 SHA-1: 2ba561c79b081ea9e9ef9e0f98a7f4b639984455 SHA-256: de34d0b5125b0e6ebebce267c2f8b09ffac1951a90a83270655abb7221e9d2aa
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high number of embedded URLs pointing to various domains, many of which are disposable or dynamically generated. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the attack pattern of using a large number of links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://jottigo.ru/strik?utm_term=is+pit+boss+made+by+traeger PDF link annotation
    • http://titanovyi-filtr.ru/fsc_part_2_chemistry_bookpnhv5.pdfIn PDF document text
    • http://webcam-model.online/how_do_i_make_my_fire_alarm_stop_chirping5zjit.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/igz7hbP/tower_breaker_hack_and_slash_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/lomabufu/YjelnGV/kasutodaxesowosap.pdfIn PDF document text
    • http://biwadevebudorif.22web.org/authentic_happiness_seligman_download.pdfIn PDF document text
    • http://soxiwokix.iblogger.org/36744071785.pdfIn PDF document text
    • http://matroskin.space/jowiwagisilimopobimerifaw85jt8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501975/normal_60543af56b1c7.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvevalor/7hbam5t/ww2_fighter_squadron_names.pdfIn PDF document text
    • http://egosikenclub.com/sony_rx100_vii_release_date_2019vizbu.pdfIn PDF document text
    • http://shoop-fe.ru/56131033423m24vh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450351/normal_604956117f7d3.pdfIn PDF document text
    • http://bubiwikozexamo.iblogger.org/bu_online_application_form_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/jeDtxjb/guided_reading_level_g.pdfIn PDF document text
    • https://tadilagene.weebly.com/uploads/1/3/1/3/131381422/b248c23fac93d0.pdfIn PDF document text
    • https://semetipakes.weebly.com/uploads/1/3/0/7/130775831/5a0bbe72c1ce.pdfIn PDF document text
    • https://xelipifexejup.weebly.com/uploads/1/3/4/8/134848770/9a59d7e4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://javozajesaretu.epizy.com/lopumitemonusa.pdfIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_8e27815a54464286a86f5e28b9d4e8e4.pdf?index=trueIn PDF document text
    • http://gazezubutajon.rf.gd/are_there_eggs_in_nabisco_graham_crackers.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_15253af8f6e74d0d9bca0a8285c82e18.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 5424 bytes
SHA-256: fb89ce7546fa59177a007697121ab8c2e8f33530bb78288c46502c5113c0f3ba
font_01_sfnt_off00010817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10817 10988 bytes
SHA-256: 1290e4ff96128f42ef5683688fb3b0294e5cf79a41c3746dfee2edbccec66c62

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