Malicious PDF — malware analysis report

Static analysis result for SHA-256 5878aae3a2f7dc8b…

MALICIOUS

PDF

82.3 KB Created: 2021-03-14 02:52:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0471ce35c53845078069bc87af0f24a5 SHA-1: a492e493fcfb7cd4f7fd4eb1febda5b935938e12 SHA-256: 5878aae3a2f7dc8bd6589088af8a4a3852e3406c7be0e1a8e201a21e8c879811
156 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 0.9997

Heuristics 5

  • 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.
  • 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://maypoin.ru/123?utm_term=transformer+voltage+and+current+calculations PDF link annotation
    • http://vovpomnim.ru/gubifijuxoaesev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402707/normal_6028efed258a8.pdfIn PDF document text
    • http://natlab.ru/beige_dining_room_chairs_set_of_6xgr4d.pdfIn PDF document text
    • http://vezerfa.xyz/causal_comparative_research_design_examples6sjbv.pdfIn PDF document text
    • http://wgathering.org/33062652607bpgmw.pdfIn PDF document text
    • https://jeluxipofike.weebly.com/uploads/1/3/4/4/134490416/loziwomijupipa.pdfIn PDF document text
    • https://wovugozota.weebly.com/uploads/1/3/2/6/132695813/7397945.pdfIn PDF document text
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/2746894.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389084/normal_5ffc874ea99e3.pdfIn PDF document text
    • http://onsideball.info/utilitech_jet_pump_pressure_switchd51yh.pdfIn PDF document text
    • https://sepuvomaxobaba.weebly.com/uploads/1/3/5/3/135311468/2440b435461.pdfIn PDF document text
    • https://dezusopivelisuk.weebly.com/uploads/1/3/4/7/134734284/wovajisolorusi_bumokivus_zinivipatij_dozimis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_33340e06e19948b780f35066e409cb38.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/janodojivi/bittorrent_speed_up.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/70351420053.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/the_expanse_books_good.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/lemajanuxekimebides.pdfIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_9f6a4e5d64984dd28108260d5798ec13.pdf?index=trueIn PDF document text
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_0f3e7eb969504564a36bfe754e583792.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/2001_dodge_ram_2500_service_manual.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_off00010119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 5352 bytes
SHA-256: fdf93a153baf349e3a30d26f632ade0b283864d7daa21e24a9d0eb78d52f617c
font_01_sfnt_off0001133d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133D 11724 bytes
SHA-256: 18f11a0463bbaad33c632bee67f9804bfc5003a774960f14048b7873ab90a3a9

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