Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfcc073fe1b60bf…

MALICIOUS

PDF

87.4 KB Created: 2021-02-13 12:44:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c72a62b89f5299ef96b30dc5c22830e4 SHA-1: 75d56f6f96095bd617e6832aba0fffc887c4ac7d SHA-256: dcfcc073fe1b60bf864b49c5cfd2f32a8997a5156e7df2fc277805fd19fc0f7e
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link farm. The document contains numerous links, including one pointing to 'crophysi.ru', which is likely used to redirect users to malicious sites. The presence of many links on disposable hosting suggests an attempt to distribute malware or conduct phishing by impersonating popular content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://crophysi.ru/123?utm_term=kingsman+2+download+full+movie In PDF document text
    • https://cdn.sqhk.co/bugininaxi/cjaH1gg/ariel_little_mermaid_hd_wallpaper.pdfIn PDF document text
    • https://gekojufoj.weebly.com/uploads/1/3/4/4/134438070/2754729.pdfIn PDF document text
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/7dba0c6e2742f.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/gfqthhS/dinosaur_rampage_game_download.pdfIn PDF document text
    • https://rugepokowefi.weebly.com/uploads/1/3/5/2/135294276/3260015.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/W8vjcS1/inter_football_manager_lite_app.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/SAic8jb/baby_phone_number_whatsapp.pdfIn PDF document text
    • https://cdn.sqhk.co/faresawuf/ijhcJ45/word_cookies_game_download.pdfIn PDF document text
    • https://womazineput.weebly.com/uploads/1/3/4/8/134895737/7dec181b.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/PJiFha0/asteroid_hitting_earth_movie_scene.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/ihbngh1/zamixikerani.pdfIn PDF document text
    • https://redulexaxoxega.weebly.com/uploads/1/3/0/8/130874010/081072dc43b7cb5.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopiroxab/heVp9zx/lol_remix_dolls_names.pdfIn PDF document text
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/tunofizude-xezupiwakiko.pdfIn PDF document text
    • https://sejumajofejopib.weebly.com/uploads/1/3/2/7/132740214/72ed7ca.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/xomepixo/tibia_paladin_gear_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/jikepubimineleli.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/fagovukujalanumavitenu.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/diet_for_peptic_ulcer_disease.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/savaxetipedisupajuriva.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/self_appraisal_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/87063228577.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_off00011a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9A 5384 bytes
SHA-256: d3a3552838581fe4bb13653a6d61b5f594a85e879ab1d0387da8dccf8304e30c
font_01_sfnt_off00012d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D04 10184 bytes
SHA-256: d6f9c45d1669153873c2b0aa664095a9cc5a8b8eadbeb15d167594800c4fcf6c