Malicious PDF — malware analysis report

Static analysis result for SHA-256 8769c5ddec86132f…

MALICIOUS

PDF

81.8 KB Created: 2021-03-18 06:45:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1e5fead1927d01ec028b3b3309ee3270 SHA-1: 4ccb24af90616e792967bf3fc4123b137845e65a SHA-256: 8769c5ddec86132fc60b36b1f73a4e90440ee3a05ce407a183b153e0333b82ac
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which is not inherently malicious but can be used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/aws?utm_term=blheli+esc+instructions PDF link annotation
    • http://topuniversityru.fun/piduraduporivemigej88qp.pdfIn PDF document text
    • http://eroganoficial.site/android_x86_dual_boot_windows_10w0zvj.pdfIn PDF document text
    • https://pezusipadivo.weebly.com/uploads/1/3/2/3/132303316/tuvipapov.pdfIn PDF document text
    • http://morpeoplelife.ru/why_does_my_kindle_not_charge_fullyh1ukl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408333/normal_6021f87776df0.pdfIn PDF document text
    • http://trydouche.xyz/self_reliance_ralph_waldo_emerson_audiobooksvhsy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453117/normal_6010e2595250e.pdfIn PDF document text
    • https://verakolor.weebly.com/uploads/1/3/1/3/131379730/07273ae.pdfIn PDF document text
    • http://lnstagramverifycentre.com/57088621141r1yxz.pdfIn PDF document text
    • http://luminar2-download.xyz/international_finance_corporation_philippines_addressj5cdd.pdfIn PDF document text
    • http://frukt.fun/find_my_phone_free_app2pbxz.pdfIn PDF document text
    • http://profyhouse.ru/asp.net_mvc_4_identity_tutorialt5nnf.pdfIn PDF document text
    • http://tvoyoproc.fun/applied_business_statistics_by_trevor_wegner_3rd_edition_free_download53g40.pdfIn PDF document text
    • http://tameenegypt.com/xamuriwugarixoto3viz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414500/normal_5fe28b7624333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481397/normal_601b8c922cf87.pdfIn PDF document text
    • https://fepepifufom.weebly.com/uploads/1/3/1/8/131872298/jatotew_wokusuz_gororiwis.pdfIn PDF document text
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/7461303.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/4b7a9710-d2f6-42e6-aee8-9ccae026090b/what_does_auld_lang_syne_lyrics_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f991574-d503-4200-b44a-844605c30841/ridgeway_grandmother_clock_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ed24cbb-45e9-480f-ac41-5fb798935097/zalovovarigalowonapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d78c8d91-6713-4b44-b51a-fb92a40a77e9/taotao_50cc_scooter_body_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5731641a-bb3d-4be8-8899-39e5cca6826d/will_there_be_a_movie_for_red_queen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1f39e50-bffd-4506-b662-43cf6a6e2ee8/how_to_find_my_hotpoint_oven_model_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc669805-bd56-421c-aec1-f5a1722d2a00/comentario_bblico_matthew_henry_13_tomos.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 4724 bytes
SHA-256: 34cdbd30d86a4ab98ad9793ed0bcf4ada59bc0ca823bf55f2abedeaea47572ad
font_01_sfnt_off0000fce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE8 11084 bytes
SHA-256: 5ce74b2df5728719bda69dc648416623b41d7a4bb272224cf40c39b29e6ca84c
font_02_sfnt_off000122b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B8 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501