Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37f72c8eadc2974…

MALICIOUS

PDF

75.8 KB Created: 2021-03-23 23:30:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0fd60cce7a21d7398dfb2bce4ec4ca35 SHA-1: 390aa6c670397bf3d193eaa4f8a6542d4e6f9d0b SHA-256: e37f72c8eadc2974bb195ad8bfcd8fb4f2a55c8db5460dd160c8c45476c871d7
226 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic firings point towards an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://resalured.ru/wix?keyword=google+for+ipad+download PDF link annotation
    • https://cdn.sqhk.co/kujufemom/dMigGYF/download_game_zombie_combat_simulator_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/sivefuxonix/gWsnFhc/42732548790.pdfIn PDF document text
    • https://cdn.sqhk.co/lakodatoli/dZghigX/crush_the_castle_3_weebly.pdfIn PDF document text
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/2768468.pdfIn PDF document text
    • http://mexicotop.xyz/zerorijevosovanubugixujovwkzef.pdfIn PDF document text
    • https://tineminelebon.weebly.com/uploads/1/3/1/6/131606156/josotutumuna.pdfIn PDF document text
    • https://nogikukejigili.weebly.com/uploads/1/3/0/8/130873965/ragawulakipibufa.pdfIn PDF document text
    • http://fruit-citrus.space/fubelelipinomalunufoz4f2s5.pdfIn PDF document text
    • https://cdn.sqhk.co/falupuvevore/YjbKjux/skins_colorado_springs.pdfIn PDF document text
    • https://cdn.sqhk.co/guzamuvi/3IpA5YH/59042150420.pdfIn PDF document text
    • https://cdn.sqhk.co/baziwuwe/vJjegh8/didi_hirsch_alive_and_running.pdfIn PDF document text
    • http://ledy66.net/gadijixarenezulazdhdv.pdfIn PDF document text
    • https://dizavobezovedup.weebly.com/uploads/1/3/5/3/135313146/2257007.pdfIn PDF document text
    • http://zijixiteluwek.scienceontheweb.net/1984_study_guide_answers_part_2.pdfIn PDF document text
    • https://zanokelalugabu.weebly.com/uploads/1/3/5/3/135315143/1265323.pdfIn PDF document text
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/lizowikitibuza.pdfIn PDF document text
    • http://palaxofivuleduj.medianewsonline.com/noteladasile.pdfIn PDF document text
    • https://biwizodem.weebly.com/uploads/1/3/4/6/134650183/kixamajerapa_pevuponamugalek_tugunujededesu.pdfIn PDF document text
    • https://gunesakozi.weebly.com/uploads/1/3/0/9/130968934/2251020.pdfIn PDF document text
    • https://teleroxekafi.weebly.com/uploads/1/3/5/3/135321942/d7395b088e8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zesafemumibow.myartsonline.com/21868798613.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_off0000ecff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 5156 bytes
SHA-256: 1b96c2e50d99c62fce789fd9ea70a6eb6364a0a8d8c0bb6217071e555fb1849a
font_01_sfnt_off0000feb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 10532 bytes
SHA-256: 3d6a280abbd5a13f747352f7f3fd2c4d6f04590553f3b5cc16949b3d02fdeb94