Malicious PDF — malware analysis report

Static analysis result for SHA-256 1729b07b0a55721c…

MALICIOUS

PDF

80.1 KB Created: 2021-03-22 18:31:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4c9f320e280410b2cf4ad089a60a991e SHA-1: ee9545b7e720e85dd3c2bc9c4ffba382bf656b6a SHA-256: 1729b07b0a55721c218bab0d91252e54d339ceff6fb1ecf2ba1f784e796fcb00
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to SEO-optimized PDF files hosted on various domains, many of which appear to be disposable. This pattern is indicative of a link farm designed to attract traffic, potentially for phishing or to serve as a distribution point for further malware. The ClamAV detection and ML classifier strongly suggest malicious intent, and the presence of embedded URLs supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/award?keyword=golongan+obat+antasida+pdf PDF link annotation
    • https://cdn.sqhk.co/pakevetuzi/ejbjegj/football_referee_costume_mens.pdfIn PDF document text
    • https://cdn.sqhk.co/jojipimuve/G2WMjfw/nokerad.pdfIn PDF document text
    • http://bitjoms.xyz/702429834089ikgy.pdfIn PDF document text
    • https://cdn.sqhk.co/fonazovep/Eugd35h/kogeleri.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/gdhhgjd/premier_league_top_scorers_2018_19_table.pdfIn PDF document text
    • https://zulozuger.weebly.com/uploads/1/3/5/3/135310252/8296238.pdfIn PDF document text
    • https://tujobofawoti.weebly.com/uploads/1/3/2/6/132695409/jogiraxutonad.pdfIn PDF document text
    • https://wajiwojoduposop.weebly.com/uploads/1/3/1/3/131379590/6800699.pdfIn PDF document text
    • https://kebufuwotum.weebly.com/uploads/1/3/4/0/134040355/morolikoxejul-raborugafujekoz.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/ultrasound_guided_cortisone_injection_shoulder_near_me9ek4p.pdfIn PDF document text
    • https://wuwinotidewav.weebly.com/uploads/1/3/5/3/135349353/2563a77.pdfIn PDF document text
    • https://nevuvipegigi.weebly.com/uploads/1/3/4/5/134589722/2290582.pdfIn PDF document text
    • https://nabovuguxobe.weebly.com/uploads/1/3/1/8/131871891/vozunezezubaz-lojugawawida-mitew-ganemojafezono.pdfIn PDF document text
    • https://poxobavu.weebly.com/uploads/1/3/1/4/131453713/tolukiragufagogu.pdfIn PDF document text
    • http://medicalpracticementor.com/complex_fractions_worksheets_for_7th_graders4bmql.pdfIn PDF document text
    • https://wumifidadorubip.weebly.com/uploads/1/3/5/2/135298964/7a42588f0a33b.pdfIn PDF document text
    • https://xepesirivow.weebly.com/uploads/1/3/1/4/131408502/wawulokizozuwow-xivuturakix-nezuwagedidukoz.pdfIn PDF document text
    • https://muvisodujop.weebly.com/uploads/1/3/4/3/134358588/5180324.pdfIn PDF document text
    • https://cdn.sqhk.co/savaketiju/ajgpjb8/senosaruruwoxidedikilomos.pdfIn PDF document text
    • https://polatubogo.weebly.com/uploads/1/3/4/5/134598163/7686225.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8094eff5-95f2-4f2d-9cd1-b72819bf7555/69293124533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29866da1-3f8a-47f1-941c-1ca624799e5e/scott_westerfeld_books_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3396c74f-20ee-40d8-9d5c-ede014df810d/nunamowiganakivisogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53f77c0f-18b2-47ba-a7a5-b743c1222e19/why_is_finland_the_best_education_system_in_the_world.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_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 4952 bytes
SHA-256: a75d6f4b15587a5c8a8dfa0fdabc44c938228edddb325a85e5d4f325bceab7bc
font_01_sfnt_off00010161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10161 10392 bytes
SHA-256: 078cc80b8bd381efd0ca102644b96f849d7273e6f1c541a983b747a5beafb935
font_02_sfnt_off000124f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F6 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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