Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf2d3bf32b9cc01…

MALICIOUS

PDF

78.8 KB Created: 2021-04-03 02:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1bc1f2ba602d3f5e6dab5d6a6090196a SHA-1: 86fbcad7094d0e556dbb09d040f9f3a5cd7c1908 SHA-256: 0cf2d3bf32b9cc014b8ae865f762b125d059fea24ef601042d29b18d6f4a56e7
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files, many hosted on domains flagged as disposable or malicious. This behavior is consistent with a link farm designed to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=this+is+the+police+trophy+guide In PDF document text
    • https://cdn.sqhk.co/xenudipu/geRpicd/streamlabs_change_profile_picture.pdfIn PDF document text
    • https://cdn.sqhk.co/jobebakegip/ijjeKeI/niregetawudofepumasoforu.pdfIn PDF document text
    • https://cdn.sqhk.co/zamodozitip/sifigYs/online_radio_box_premium_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/ji1WXzX/make_master_shop_for_roblox.pdfIn PDF document text
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/welet_zorewunog_kikulitax_dejedu.pdfIn PDF document text
    • http://tesar-krd.ru/14127966364qha2t.pdfIn PDF document text
    • http://sweetygirl.club/joremkn2s1.pdfIn PDF document text
    • http://scrlt.xyz/sims_4_lunar_zodiac_challenge7iuxi.pdfIn PDF document text
    • https://siselujasukoju.weebly.com/uploads/1/3/0/9/130969984/1352838.pdfIn PDF document text
    • http://siondez.ru/136582008740q8k4.pdfIn PDF document text
    • https://cdn.sqhk.co/zirevazul/idgfjeh/ifab_laws_of_the_game_2019_book.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/5j9P6hi/baitcaster_catfish_rod_and_reel.pdfIn PDF document text
    • https://cdn.sqhk.co/sejiragidu/gdhcjbs/fikenefuwimepu.pdfIn PDF document text
    • https://cdn.sqhk.co/gadowikuxe/oT5rLrq/briar_hill_infant_school_uniform.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/hhbq2ic/3_subject_spiral_notebook_graph_paper.pdfIn PDF document text
    • https://cdn.sqhk.co/nakijalufiw/cZR9gfL/82572722161.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/kimone/88768627796.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac33d3d1-b0c7-4d7f-b6f1-7f40b3982b60/3732212018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b1f4e8-85bc-4411-8db3-0507f9a28428/14545869313.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/how_to_clean_convection_oven_fan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/467c1c5d-b92f-4cb9-975e-5b3bfc48382a/how_do_i_change_my_scansnap_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c14a68d0-d9a7-4bd2-b4ab-fd0cdc9a056e/52456253732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99760b36-c853-43a4-9794-c32e62026632/kewiwuzunudexodiborizomi.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/98206667092.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_off0000f7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A7 5176 bytes
SHA-256: f0341e41c33c7bacb6ab439039f745d06a970429b4647ce025f6a803d096a2f5
font_01_sfnt_off0001094b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094B 10680 bytes
SHA-256: f0dd8aa8e2128091fc5ee02b638583000b13afd7664376636af10af36773d96b