Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8c83715975f609…

MALICIOUS

PDF

141.9 KB Created: 2021-03-16 18:34:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03d1048e6fa18243f6f77228a4eb9969 SHA-1: 7984bc2a0b9b6e3b46c46a63395448690b8052d9 SHA-256: 0d8c83715975f609fe79dbeb9fdb41566054c57a941ef58c99e54a063d283e6a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the nature of these links as a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/123?utm_term=format+factory+setup+exe PDF link annotation
    • http://galoomer.online/hd_movies_free_kabir_singhect4n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480743/normal_6020cb65a4a36.pdfIn PDF document text
    • https://cdn.sqhk.co/salozudat/bhgDig2/flight_tracker_apk_full.pdfIn PDF document text
    • http://cabinetsly.xyz/how_to_replace_a_thetford_toilet_sealzcdm1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426679/normal_5fca212ca3307.pdfIn PDF document text
    • http://onlineeshop24.xyz/ic_engine_parts_pptz5gx3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_6031bf386a0cd.pdfIn PDF document text
    • https://cdn.sqhk.co/geruvijiwiw/Whi2Fge/66846948912.pdfIn PDF document text
    • http://bestsalestoday.xyz/who_plays_the_siren_in_vampire_diaries_season_858nnh.pdfIn PDF document text
    • http://fortuneo-enligne.com/davulusosewutiyx23r.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/wghhlhc/22776897771.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/gjgckij/burger_king_open_right_now_near_me.pdfIn PDF document text
    • http://tameenegypt.com/is_a_convection_oven_and_a_toaster_oven_the_same53j5t.pdfIn PDF document text
    • http://velesvoyage.ru/32417307264o07w7.pdfIn PDF document text
    • http://bahis-sikayet.com/early_stages_of_pimpleg7y49.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/jc6jejd/7969623547.pdfIn PDF document text
    • https://cdn.sqhk.co/rasetiwulipu/ibiggfE/f1_mobile_racing_2020_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455207/normal_5ff3aba929881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_6040ec22a4ab8.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/9c261d7e-3545-4ed6-9b48-76923bdbf26d/tavipakevaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c63f49bf-c761-46bf-b8da-86377f4fb0ab/28711174181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70fe4882-5f81-4743-aeed-3a2e2e50ebcc/puvelojeniwowijuwawopukuv.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_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 83108 bytes
SHA-256: fc0b95da86a2144f045573abfc5029a3fe606e7a8f990ed1b7e8a9648aabf2a2
font_01_sfnt_off0001f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F18D 5252 bytes
SHA-256: 92ca04315c6d905ea80e3c028fb453e72c4d4ee16d4c1260f4afd9cef05a7510
font_02_sfnt_off00020368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20368 10568 bytes
SHA-256: 786e456b351dc41143a687917d47c3360e9beb76ed7f504975504d33918a1a4d

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