Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc8898716151f47…

MALICIOUS

PDF

74.3 KB Created: 2021-03-21 04:23:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 8db42f8c89fd60df253d0cc6a498b633 SHA-1: f533045df3c3d6796bd7e4cca5cfe0869b6e7263 SHA-256: dcc8898716151f4700b4e661ad99b47781dbf1dc668ede3123516aa479c1b6f6
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with several pointing to disposable hosting and acting as a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 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://ponafet.ru/wix?keyword=class+a+cherub+book+pdf PDF link annotation
    • http://biweekamnf.com/employee_absent_letter_format6m13i.pdfIn PDF document text
    • http://sodaapp.club/fozafelowalifaluki6krx0.pdfIn PDF document text
    • http://kwini-fini.online/55789484782jqgrd.pdfIn PDF document text
    • https://cdn.sqhk.co/toriwogadej/ifAygfj/zoguxigojuwuwawiroj.pdfIn PDF document text
    • http://ca-manalapan.space/pokemon_go_kanto_pokedex_151ru4q8.pdfIn PDF document text
    • http://canonsburglake.com/taekwondo_black_belt_forms_names85nhl.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/fBVhcgf/mind_games_for_dogs_diy.pdfIn PDF document text
    • https://cdn.sqhk.co/kovutego/SSibyIN/vemososivoxezi.pdfIn PDF document text
    • https://cdn.sqhk.co/kexofebiziv/fjbhbhd/58201696744.pdfIn PDF document text
    • http://smm-target.ru/winter_wonderland_sheet_music_easyauy9a.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/EmKYhb1/vuxudibisakisosumemitew.pdfIn PDF document text
    • https://cdn.sqhk.co/goremujoz/01jhbUo/clipart_playground_slide.pdfIn PDF document text
    • http://kmikaerfs.ru/cuanto_equivale_1_metro_en_centimetrosano5o.pdfIn PDF document text
    • http://arnautmebel.ru/blood_test_report_analysis1s6db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liwituro.epizy.com/how_to_change_the_blade_on_a_toro_lawn_mower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec334907-583a-4a48-9fdc-92555ac05e0d/55796004707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0da59a82-f340-4085-9885-5985db9b0a22/do_xbox_360_turtle_beaches_work_on_xbox_one.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_off0000e502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 5352 bytes
SHA-256: 9e35192a6717ecb15b8cc04680922b43ba8209ac669b8c4ce5c89abf09c4c460
font_01_sfnt_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 10836 bytes
SHA-256: 361fe46d0c873e0839f41f6b9a76845e816c376a41be3b994940f20e25938340

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