Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7c14acd1167025…

MALICIOUS

PDF

69.5 KB Created: 2021-04-09 09:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9827ebef9ccc889ee85f821a934d04eb SHA-1: c91913c841cf50da6904ee31ee9e90e8c8b0a0b4 SHA-256: fa7c14acd1167025c31376e740fac9e19ede79764aaa74dadacfa575f66ccaaa
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various domains, many of which are hosted on disposable infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links suggests an attempt to create a link farm for SEO manipulation or to host a variety of malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=sodastream+cylinders+amazon In PDF document text
    • https://cdn.sqhk.co/duzoxibuf/hEBhdgf/tyrion_lannister_biological_father.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/iisoNfm/megan_is_missing_real_story.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/8hg5hbT/ahlta_chcs_job.pdfIn PDF document text
    • https://cdn.sqhk.co/kosojilufut/RgfyiaN/russian_ak_front_sight_block.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404750/normal_604b323e85ecb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390999/normal_5fee82630bbbd.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/gijclhi/stickman_ice_hero_crime_city_rope_heroes.pdfIn PDF document text
    • http://copyrighthelpbusiness.net/19920283642elnx6.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaluwozez/dggcqia/zikowuvusowa.pdfIn PDF document text
    • https://cdn.sqhk.co/solumapidema/T6heZhg/acrylic_nails_coffin_shape_designs.pdfIn PDF document text
    • https://cdn.sqhk.co/sebuwemid/egjaIpj/sekoxaroxak.pdfIn PDF document text
    • http://meetsalle.xyz/88672336336wfcq7.pdfIn PDF document text
    • https://cdn.sqhk.co/lemusezilaz/cjajjhg/best_songs_of_all_time_youtube_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464327/normal_5fe5b15a56d42.pdfIn PDF document text
    • https://cdn.sqhk.co/givifevulo/SjcMgec/surezuvag.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/jcjeEgi/dirt_bike_tracks_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/RKgjxcL/download_onedrive_machine_wide_installer.pdfIn PDF document text
    • http://kdghy.online/sears_craftsman_garage_door_opener_remote_control_3-functionxhe8c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://54a0e2cb-796f-4f80-9aaf-d11633176b06.filesusr.com/ugd/b0c554_52eb0bff9bee48ad846f63271ab26532.pdf?index=trueIn PDF document text
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_2947a9e80dde4a9aa42ba319058227d1.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_99c46bc314f6408fbfaa19ce414b595e.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_off0000d08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08C 5340 bytes
SHA-256: 733f6348921ba197d57484478cae5b9faa5352ff26fa975ef80aa776975824b6
font_01_sfnt_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 10668 bytes
SHA-256: 1f7b9fdec1d98a0164e4f955a79751e2c31b4325a935d5db9c46b2e6b1767fc6