Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3f765c2348bf14…

MALICIOUS

PDF

72.1 KB Created: 2021-03-15 17:11:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d4e9dd4d5d1af93faa927cff2a78cd0b SHA-1: 9ec0930ba7ad07f51ffad0c4bbc55253702cc2e9 SHA-256: ce3f765c2348bf14685fe574ae8155902719d938558dee76bb155fc13dcf1b8a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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://kuzutuzo.ru/aws?utm_term=why+won%2527t+my+moto+z+turn+on PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370319/normal_60167d33617cd.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/je8jdvG/60380058008.pdfIn PDF document text
    • https://dopovubejaxow.weebly.com/uploads/1/3/4/0/134017692/298564.pdfIn PDF document text
    • https://cdn.sqhk.co/firataxoworo/G5jgife/mystic_messenger_download_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/jieWghN/gowaxafekolaxovafavo.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/diaw1Ao/free_movies_streaming_online_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/pimabosi/BKjjfie/death_coming_up_the_hill_full_book.pdfIn PDF document text
    • https://cdn.sqhk.co/vudararemane/hWXHMNR/10740999300.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469837/normal_6002d7b4c6fc1.pdfIn PDF document text
    • http://mirumumavetifun.mypressonline.com/timebuwufavijidowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502188/normal_60243c8c654a6.pdfIn PDF document text
    • https://fezowekufeda.weebly.com/uploads/1/3/3/9/133999429/f6c62c1a73b31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_603cfa42b6421.pdfIn PDF document text
    • https://cdn.sqhk.co/nimotixalulo/eGhhjbX/6912680138.pdfIn PDF document text
    • http://maxobujixeweden.sportsontheweb.net/fakumexufuvofowibokowimeg.pdfIn PDF document text
    • https://gebonevoduxap.weebly.com/uploads/1/3/1/6/131606392/putolegupomikugew.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/402f56d3-e935-4c4c-a416-cea2d4e83630/32304926141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a90eca4-9c75-4487-9c22-24a641f7273a/bewiramad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/829e132d-644c-4cea-ac61-ce87d03b8c0a/38685096440.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_off0000dd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3D 4796 bytes
SHA-256: 2ea442d0d0ae58a79b80962b2bbaf217dc719bf42a537101a592b5a728292c17
font_01_sfnt_off0000ed89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED89 11032 bytes
SHA-256: 38ecc0f594d43fa5ea4bb50be350073afd41d041de96771799d072834b6ad7bc

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