Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d78240f2ee574c…

MALICIOUS

PDF

73.1 KB Created: 2021-06-13 17:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c40ab896212e6ab3793bd4164208439c SHA-1: 132a72c3788435a88ce6b1896181ccb563f80d4e SHA-256: b6d78240f2ee574cefae0faf9ec63ed77734fa050f34c1e4dc02f162ca4ba0ca
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/pbw?utm_term=difference+between+inductive+and+deductive+theory PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369525/normal_6008515437212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416149/normal_60baee983a1ee.pdfIn PDF document text
    • https://tofeniva.weebly.com/uploads/1/3/4/6/134625175/jisul-sezejowo.pdfIn PDF document text
    • https://magaxopix.weebly.com/uploads/1/3/4/6/134647228/podagisovora.pdfIn PDF document text
    • https://bevowodawalejap.weebly.com/uploads/1/3/4/3/134363876/joziza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392474/normal_6017400ae9b63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417992/normal_6027075256bff.pdfIn PDF document text
    • https://xalakadumikimam.weebly.com/uploads/1/3/1/4/131437423/57769.pdfIn PDF document text
    • https://sejoxamopizava.weebly.com/uploads/1/3/1/8/131858661/posorev_xobalaf_tiwezip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380857/normal_60667602ac0b5.pdfIn PDF document text
    • https://noxojinuk.weebly.com/uploads/1/3/4/4/134479051/2e628f15d00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pakesobiroge.pbworks.com/f/why_does_my_whirlpool_oven_not_heat_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35e85b15-271f-4237-9dda-6c456db26ef1/bubble_witch_saga_3_tips.pdfIn PDF document text
    • http://jetubabup.pbworks.com/f/12267089966.pdfIn PDF document text
    • http://ralogotuxa.pbworks.com/w/file/fetch/145149732/barbie_dream_house_adventure_unlock_vip.pdfIn PDF document text
    • http://bilabegape.pbworks.com/w/file/fetch/144441678/jezevinoziduxavege.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/w/file/fetch/144411669/how_to_find_gmail_account_location.pdfIn PDF document text
    • http://jorowad.pbworks.com/f/how_to_restart_echo_show_8.pdfIn PDF document text
    • http://garifukedako.pbworks.com/f/pazowak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f07c484-02ab-499b-b803-e1d4de2a7d53/osha_30_hour_construction_training_materials.pdfIn PDF document text
    • http://sofabiz.pbworks.com/w/file/fetch/145120596/molelovefid.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_off0000e0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CD 5292 bytes
SHA-256: 0f4e05207c5032f3a2aea31103fe6d465b81250138da6be3fae9cee0ba8275c8
font_01_sfnt_off0000f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 10508 bytes
SHA-256: 4c71af1fdd5b78e4fbbc09561d022d095481453ee3484d4b328db80dea60b46a

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