Malicious PDF — malware analysis report

Static analysis result for SHA-256 a951d92070d79a81…

MALICIOUS

PDF

84.5 KB Created: 2021-02-24 11:41:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 41ee62dd204e1fce207893fe2e2b84dc SHA-1: 7ca7d60e783ecaafff258a0d5a0a29592dcde264 SHA-256: a951d92070d79a81331fcaa5990bbd4e1cd61f034824b3179a4821fa89aa9fb0
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure. The primary purpose appears to be directing users to external sites, which is a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/strik?utm_term=ch%25C5%25ABniby%25C5%258D+demo+koi+ga+shitai+light+novel In PDF document text
    • https://cdn.sqhk.co/komagiju/iecjgja/subadagopebigazirifew.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/titapaxogowuguz-zuzovobifug-wasefijeba-vinilumetedajim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453100/normal_6013a30297d66.pdfIn PDF document text
    • https://cdn.sqhk.co/nilamemiw/4xjc0hi/gemakakid.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/oIid3H6/95383839828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465537/normal_60243b09ce0e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475727/normal_5ffe414b28c84.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/hghfjbS/fitbit_sense_vs_apple_watch_se.pdfIn PDF document text
    • http://tameenegypt.com/most_common_english_phrasesqs1tw.pdfIn PDF document text
    • https://gamevuwi.weebly.com/uploads/1/3/4/5/134525912/gafeladekamoli.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/uehbgch/52098485334.pdfIn PDF document text
    • https://lonawapusar.weebly.com/uploads/1/3/0/7/130776864/054aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460072/normal_60328b7c81341.pdfIn PDF document text
    • http://triple-doska1.club/new_york_metro_map_2019h221d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_6016d62dafd2f.pdfIn PDF document text
    • https://cdn.sqhk.co/wazofovam/iijiigc/maxpreps_football_gallery.pdfIn PDF document text
    • http://nat-fru.space/5190546719237xzq.pdfIn PDF document text
    • https://cdn.sqhk.co/jorisuzil/ghar5gN/kilolaxukuginomim.pdfIn PDF document text
    • https://cdn.sqhk.co/nifijagik/OjYVibH/p_bandai_usa_coupon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 11928 bytes
SHA-256: e0cbbc19122cd503d8631b025cd9ab7491451ee5ef670ba73cf289387ffd0aa1
font_01_sfnt_off00010a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A70 5652 bytes
SHA-256: 2ae522c650f900a4b5feb4b70ccb814c548208a0c8bc1905a50009b30927ac0e
font_02_sfnt_off00011d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D11 10920 bytes
SHA-256: 6e81e15b102aeb4a138418264786f7f06adc0070c7f08d79df8f9072805f408e