Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa8496fc2a9269a…

MALICIOUS

PDF

78.0 KB Created: 2021-02-22 22:56:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ef26831b19dc9d372e7b418e485b3c76 SHA-1: b04307655bbbc9e55d888d4cb1abda4c3a0950dc SHA-256: 1aa8496fc2a9269a739e1b3e3050e53e105766220b0f17ae5cd6c3245cac144e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various PDF files hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=what+are+good+names+for+black+boy+dogs PDF link annotation
    • https://cdn.sqhk.co/tudusiki/bIfghbC/lebara_mobile_top_up_voucher_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/UNigs9T/49234254653.pdfIn PDF document text
    • http://pubgmobiie.com/96498261216qaov1.pdfIn PDF document text
    • https://cdn.sqhk.co/gipekoma/XGgeihi/do_pokemon_go_promo_codes_work.pdfIn PDF document text
    • https://cdn.sqhk.co/sakupiraf/ghttENf/zivosiropajebixi.pdfIn PDF document text
    • http://vipadminler.org/tamil_typing_training_bookd2x58.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/lalelalemefepeluviv.pdfIn PDF document text
    • https://cdn.sqhk.co/ronuwimo/eYgfmTF/sebugitovage.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/tljdccQ/wozut.pdfIn PDF document text
    • https://gixakipero.weebly.com/uploads/1/3/1/4/131412713/voril_tavurevaxeparot_samadima.pdfIn PDF document text
    • http://copyright-security-ig.com/17264649075j1itn.pdfIn PDF document text
    • https://cdn.sqhk.co/zomidami/BhbjjDQ/19052857976.pdfIn PDF document text
    • http://phrensy.co/63199928082pbeeq.pdfIn PDF document text
    • https://kotevopokevunab.weebly.com/uploads/1/3/4/5/134590751/janasufuden.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/iiagc7N/melubegegakerurekajokusob.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/fgfji6s/lingo_the_word_game_song.pdfIn PDF document text
    • https://wexetapita.weebly.com/uploads/1/3/4/3/134307875/5425036.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/mh3dhhL/fizikurodavirubaxewenadov.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/cRqghjj/prison_break_season_4_episode_23.pdfIn PDF document text
    • https://cdn.sqhk.co/nepodowu/eLnhhVN/yellowfin_menu_hernando_ms.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 5752 bytes
SHA-256: 5295ac5f11da501df9b67d8c448ee3acd6f1f5bc5b618de3a862bd09111d8b64
font_01_sfnt_off00010745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10745 10432 bytes
SHA-256: ff40b0ff2b12615146e43a06c72513d79726f0d1735f543827353232b10f5552

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