Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89a9f927ea20420…

MALICIOUS

PDF

139.4 KB Created: 2021-05-30 09:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f56aef772387d24bff075277be590544 SHA-1: 58a3b766bbf5c31e9c1d9e349f31244f7b1c3be8 SHA-256: d89a9f927ea20420765993db4d1a701bab16e1a01c4202e0b8d55952e4e34073
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://zajinet.ru/123?utm_term=kamen+rider+kabuto+anoboy', is particularly suspicious and likely leads to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/123?utm_term=kamen+rider+kabuto+anoboy PDF link annotation
    • https://votebefi.weebly.com/uploads/1/3/4/7/134715150/posakoboxuximijafo.pdfIn PDF document text
    • https://risenezapaf.weebly.com/uploads/1/3/4/4/134481661/kixilidoru_ninoseri_lakixajukumevuf_lifidupodinuke.pdfIn PDF document text
    • https://judikudaxu.weebly.com/uploads/1/3/4/8/134878276/jesovarotet.pdfIn PDF document text
    • https://fudukonuxevefez.weebly.com/uploads/1/3/4/6/134606022/6ca4f77.pdfIn PDF document text
    • https://fojomifurinu.weebly.com/uploads/1/3/1/3/131378835/d71945426693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376105/normal_5fdbdfa636fba.pdfIn PDF document text
    • https://pobufulali.weebly.com/uploads/1/3/4/4/134494274/df55d1.pdfIn PDF document text
    • https://tukixetijire.weebly.com/uploads/1/3/4/3/134314539/5e5bdc7a732e140.pdfIn PDF document text
    • https://kodidenub.weebly.com/uploads/1/3/4/3/134328035/1632c7459251b.pdfIn PDF document text
    • https://suvamowifav.weebly.com/uploads/1/3/4/3/134351486/2654626.pdfIn PDF document text
    • https://mizeximo.weebly.com/uploads/1/3/4/2/134265944/nukuw-juliduxaku-rajotem-toguf.pdfIn PDF document text
    • https://zikemuwebiwolim.weebly.com/uploads/1/3/5/9/135992964/donuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421641/normal_6051cbdd184a5.pdfIn PDF document text
    • https://betutinixe.weebly.com/uploads/1/3/4/4/134481053/zezaxobodatufosa.pdfIn PDF document text
    • https://fozikubovofow.weebly.com/uploads/1/3/4/8/134897471/zabofodejupabit.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/6818669.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/e7692405-4ba9-49bb-8c62-e36916a43f6a/2005_dodge_ram_1500_fuel_pump_autozone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9091b7c1-519d-4128-b5d4-8ca5f23f4d68/pafunafiwitigimibowonadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fce84606-5934-4d5b-ba8d-ac6b45835436/fogodigimawotaruk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34c09cca-9b7d-4005-a6f5-83e4ce202650/89622537162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72d98239-9dab-40d1-a991-2bd9133629e2/mini_cooper_service_schedule_uk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBB 64396 bytes
SHA-256: 8874f8e7f2678ebd46d31f66eb9612c697a7ef6907ecc0a3701027edc91f7fe1
font_01_sfnt_off0001df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF98 5036 bytes
SHA-256: 6a51873bbbc9e41632c340fbb9d4ecfbfdd55bec5006610b888310c51545fc4d
font_02_sfnt_off0001f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0AB 15704 bytes
SHA-256: 6ec3350e03e1fec4c68d04ff5586d54611fbc05e4d969522e1850dacc91e8060