Malicious PDF — malware analysis report

Static analysis result for SHA-256 483a432a69fc355a…

MALICIOUS

PDF

80.9 KB Created: 2021-04-02 10:40:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 90fda39679a1352228c6f42f179d4b3f SHA-1: 69c8b5c501109a707de9e245d72aa3210f30ec47 SHA-256: 483a432a69fc355abc72311b28db1567d2b3875dba689d847ba6fa7be4225c29
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, forming a link farm hosted on disposable domains, which is a common tactic for phishing or distributing further malware. The document body text is largely unreadable due to encoding issues, but the presence of numerous external links strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://pelibifir.ru/strik?utm_term=what+do+i+do+when+printer+driver+is+unavailable PDF link annotation
    • http://gixipures.sportsontheweb.net/66318276665.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/idTOQij/zevubepuxipawesaboke.pdfIn PDF document text
    • http://dibosezufo.getenjoyment.net/apnea_del_prematuro_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zanaforare/icEgiBW/debokibuzanel.pdfIn PDF document text
    • https://cdn.sqhk.co/gesimefav/ZiMGUle/harris_jobs_login.pdfIn PDF document text
    • https://cdn.sqhk.co/kulizuxekume/qYYejik/71083751906.pdfIn PDF document text
    • https://mitukuruzatag.weebly.com/uploads/1/3/5/3/135346955/xuxelupulujaxoj_wiwimadu_gigewufus_lubasedow.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/ghghjaK/read_along_the_lines_meaning.pdfIn PDF document text
    • https://wopuvonu.weebly.com/uploads/1/3/1/3/131384791/nopov-wewejidasirujod.pdfIn PDF document text
    • https://cdn.sqhk.co/waderapal/ge6P3ha/linear_equations_in_one_variable_class_8.pdfIn PDF document text
    • https://cdn.sqhk.co/miwavilusaji/jjbIpsN/xapirutebotuvovujijuke.pdfIn PDF document text
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/4195a.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/CiiViaO/93160623684.pdfIn PDF document text
    • https://mikixobitesa.weebly.com/uploads/1/3/0/7/130776626/paneta-jaxogewoji-biriduda.pdfIn PDF document text
    • https://lulogozikojag.weebly.com/uploads/1/3/1/8/131858975/2241111.pdfIn PDF document text
    • https://cdn.sqhk.co/lupekute/g0jcavE/ultrasonic_sound_generator_app.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/9Anjay9/nodugonaxeninuxafeluf.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/2snijgu/wire_size_chart_awg_to_mm2.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/ifFgfUU/league_of_legends_wild_rift_beta_apk_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vubelifijam.atwebpages.com/autocad_cursor_command_box_missing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c74e5163-afd3-4764-aa73-4b9f4ad73031/92817846278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4010d466-abcd-4a6d-bc39-5ebd5a8775d3/gevifez.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_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 5352 bytes
SHA-256: cac420042bfd8677d450d90e167c23a87a1a4d3be15d3266bfb15528f0a5fee2
font_01_sfnt_off000112b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B3 10252 bytes
SHA-256: 7ba2a154770c214fe1d4d2d2742d6d62ad00f864540e8d70d593d597bf79fb1d