Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c1fbb79504715e…

MALICIOUS

PDF

78.4 KB Created: 2021-04-05 06:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0603a0926e680273061fad7126a96fd9 SHA-1: 2b47baa3ee894218f23fe60463abd11c0652d013 SHA-256: 56c1fbb79504715e4b9d2ebbf45bb22498e2c859b2ebe53ec91b6e5505ad7d72
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to potentially malicious sites, with one URL explicitly flagged as a random, algorithmically generated link. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were extracted, the PDF structure itself facilitates the redirection.

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 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/strik?utm_term=hasbro+sorry+fire+and+ice+rules+pdf PDF link annotation
    • http://kernig.pro/last_wish_raid_solo_eggs2bm4i.pdfIn PDF document text
    • http://afracheat2.xyz/wekemepak0c4l.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/ih8fjfQ/freeway_rick_ross_wife.pdfIn PDF document text
    • http://save50it.info/bodyguard_audio_songs_comef0x8y.pdfIn PDF document text
    • https://cdn.sqhk.co/vamapoludi/akhiCT5/girl_ludo_king_game_guardian_script.pdfIn PDF document text
    • http://liketime.fun/sherlock_holmes_a_study_in_scarlet_indonesiar51sc.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawitaxug/0haC4Yb/microsoft_sharepoint_online_backup_best_practices.pdfIn PDF document text
    • http://simkosa.website/84958108413exqrl.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/81894064481nkttz.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/b1iajfV/lipimotimawumagelixok.pdfIn PDF document text
    • https://cdn.sqhk.co/sekopanosesu/giBXr1z/83121592492.pdfIn PDF document text
    • https://cdn.sqhk.co/remonupode/dhhhbih/52177402704.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/31e33dd9-7838-4432-aa34-c1130ae8bbf4/zepegumupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/571bf431-519f-4472-8587-c49d34000b65/pevademapafoluxagidedato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c6ea4d1-390f-4094-9f3a-dd00007ee8ff/life_skills_lesson_plans_for_adults_with_disabilities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38b7c76f-1b93-4dd7-a1c1-f84512bf98a6/casque_shoei_neotec_2_splicer_tc-6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbe4f8c6-c9de-485d-8f21-a20e7da03c00/can_you_buy_a_replacement_roku_tv_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96218f64-64eb-46e7-944d-9973311d9e68/bose_sounddock_bluetooth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b88c534-4bb0-4d91-bb0e-70cc2c644396/94414599432.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_off0000f46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46F 5352 bytes
SHA-256: 7e5b4086d942657e98f6ce97de92b7f0717462a9769dae3a74ede498da6f8dd5
font_01_sfnt_off000106b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B4 11228 bytes
SHA-256: cdfa3030b7392b3f80333810ecaca89f4400df7597a23305ca70748f04e2adcc

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