Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b64563a57d0c99…

MALICIOUS

PDF

70.4 KB Created: 2021-01-17 00:02:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fdb9226797160bcd50124d5a2cc0bf2a SHA-1: cb0451470a5e23446a029775fd01adb21c4a08e0 SHA-256: 50b64563a57d0c991cec76155b9b7743ccc6149ce94564cadf0f610621da8a4d
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The presence of a URL with 'pokemon+go+100+iv+apk' in the query parameters indicates a potential lure for users searching for game-related content. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://trafffe.ru/123?utm_term=pokemon+go+100+iv+apk PDF link annotation
    • https://cdn.sqhk.co/girewobo/Tgi5azW/89436379139.pdfIn PDF document text
    • https://cdn.sqhk.co/gotubosif/ZCjcmii/cat_simulator_2015_black_panther.pdfIn PDF document text
    • https://cdn.sqhk.co/lonuxonemor/2ihhgia/26883425576.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/qjhejfj/best_chess_online_multiplayer_app.pdfIn PDF document text
    • https://cdn.sqhk.co/rosomugimo/dhajdgi/renexipefaruki.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/vaxologo.pdfIn PDF document text
    • https://site-1174360.mozfiles.com/files/1174360/whatsapp_wallpaper_library_app.pdfIn PDF document text
    • https://site-1178208.mozfiles.com/files/1178208/red_belt_form_taekwondo.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/parakefotulis.pdfIn PDF document text
    • https://site-1176629.mozfiles.com/files/1176629/jemofu.pdfIn PDF document text
    • https://site-1177705.mozfiles.com/files/1177705/star_wars_galaxy_of_heroes_forum_player_count.pdfIn PDF document text
    • https://site-1249008.mozfiles.com/files/1249008/blank_bar_graph_worksheets.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/pezofut/how_to_play_fnaf_world_on_mac.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58B 5152 bytes
SHA-256: c671939ce12d370e9d87401806ef96da5ecad7d43a34197ada771b96b03dfd95
font_01_sfnt_off0000e721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE721 11248 bytes
SHA-256: 1a4b214947bc99395af8ee6ffcaacb57712bdb405d01b1a38c74ba8a3151105a

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