Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf4a1cf2b3f695e…

MALICIOUS

PDF

73.2 KB Created: 2021-03-19 21:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5ef6f907bfe3e75371c6138183eefe21 SHA-1: 6ca9c74db752149a40d5fa2887edcd5502db2a4d SHA-256: daf4a1cf2b3f695e3dfe401f39bcef794af3fae7942beecda995ad9f428b0f40
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this as malicious, likely a phishing or malware distribution attempt. The presence of numerous external links suggests an attempt to lead the user to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wix?keyword=rtc+south+strip+transfer+terminal+phone+number PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427793/normal_6009d19339582.pdfIn PDF document text
    • https://taxamoxegira.weebly.com/uploads/1/3/4/8/134895948/gebowuzatekojukevexe.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/gLjdTgi/pipijorin.pdfIn PDF document text
    • http://mivukiwoluwuj.iblogger.org/62215265389.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446494/normal_600e690220d23.pdfIn PDF document text
    • http://naxuvazexipok.sportsontheweb.net/lord_of_the_flies_chapter_5_a_quote_to_show_that_piggy_is_intelligent.pdfIn PDF document text
    • https://cdn.sqhk.co/migawudewiw/fjjnmja/how_to_make_a_bolster_pillow_form.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/ZQahhE3/disney_droid_depot_backpack_cost.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/63acde0d6eb555f.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/45jjxUZ/netavonumibituvafugig.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/5ifAgiY/rwby_blake_x_male_wolf_faunus_reader.pdfIn PDF document text
    • https://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/musetesuro_siduwano_fobapukewawi_fapugelozam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408863/normal_5ffcc9e57796b.pdfIn PDF document text
    • https://wopeduvolevim.weebly.com/uploads/1/3/0/7/130776212/1751559.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/d200477c-7e6e-4d5b-927a-54c5f5a908e8/martin_luther_king_i_have_a_dream_complete_speech.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ca9b665-8090-46c7-a300-21b2976873d4/23156054500.pdfIn PDF document text
    • http://pemevunuja.rf.gd/vibukasozuzame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e7a289-6799-4aad-a2c9-4a7d7a52ca7f/2003_saturn_vue_for_sale_craigslist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4749b6ae-1a23-48b4-b7f2-df6d9ccc890b/why_do_atoms_bond_to_form_molecules.pdfIn PDF document text
    • http://wejajesenopezoj.onlinewebshop.net/34263345516.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_off0000e0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B1 5404 bytes
SHA-256: 6f2e7e73397dc261dd2d36d9ad6a4a44dfcaabbfff1109de41478ecd30d245e0
font_01_sfnt_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 10596 bytes
SHA-256: 3b5134bc1ec955411166c7cb0df446c8b06ff5c70c23b51419ebec0fb7346f25