Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7617a0a7fa2d91…

MALICIOUS

PDF

79.5 KB Created: 2021-05-18 00:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: abaf7d5285e1b775fc13a263896b103c SHA-1: 4ad2adda3dbad48398f2fc9e0a4d0dbbf086ba9f SHA-256: ab7617a0a7fa2d9186a33cd856cddf42959f10ac911df7b31e47c783d46f2be8
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable domains and redirector infrastructure, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=advanced+systemcare+pro+indir+gezginler In PDF document text
    • https://volokosebu.weebly.com/uploads/1/3/4/8/134871595/7429960.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386622/normal_6041419ef1767.pdfIn PDF document text
    • https://towedesufab.weebly.com/uploads/1/3/5/3/135392656/101b11ce62c5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465398/normal_605905578312b.pdfIn PDF document text
    • https://mikezibe.weebly.com/uploads/1/3/1/4/131453119/30b26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370767/normal_5fdf3291b4aa8.pdfIn PDF document text
    • https://pinowutofabu.weebly.com/uploads/1/3/4/7/134763632/16779.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/9001549.pdfIn PDF document text
    • https://vaguvijag.weebly.com/uploads/1/3/4/6/134610999/6e58e27ebcb6f5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366989/normal_5ffdf9b2f19fa.pdfIn PDF document text
    • https://vavagufone.weebly.com/uploads/1/3/4/3/134345741/gesurubizaxoz.pdfIn PDF document text
    • https://jazediwugitali.weebly.com/uploads/1/3/4/7/134730671/8904218.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/neviwove/what_are_fishing_gear.pdfIn PDF document text
    • http://tumaseminipofuk.rf.gd/dowujawotojugowagilon.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/annayya_songs_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/615d4cc9-6d49-4b6e-80ed-59b03b37e8b3/washington_state_unemployment_breach.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/the_secret_destiny_of_america_manly_p_hall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e65027e-3582-4661-9a4f-3e44c5cbfc8b/dlink_dir-890l_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c63b6e1-9417-4a86-b57c-9b7486008994/how_to_connect_slingbox_500.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/icona_pop_-_i_love_it_i_dont_care_-_lyrics.pdfIn PDF document text
    • http://doxewadafexe.rf.gd/hustle_castle_beginner_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a894c88-3ec8-4bc4-9b3f-b1446fdb2367/the_old_order_of_things_meaning.pdfIn PDF document text
    • http://pegewolonu.rf.gd/21st_century_breakdown_song.pdfIn PDF document text
    • http://nalujisutu.epizy.com/mujaluxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4313f0b-9f02-4afb-9ab1-bd186376366a/37925427399.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_off0000f5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 5596 bytes
SHA-256: 2fc1cbfe1c2e01567f16fdda9e72401bac9bd52ae983ae059e44e15613c95cee
font_01_sfnt_off000108b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B6 12032 bytes
SHA-256: 38ff66627e1482b0f3e6eaf3bef7ddcd0b77b169857dd7e41b3cbbeb23ce7446