Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ee2bd74677280a…

MALICIOUS

PDF

80.2 KB Created: 2021-03-20 11:12:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 126f76f28fb1e72fab7fa2c0e173dd7f SHA-1: bbae2b9323023162fafea7268dc6705ecfccaa4e SHA-256: b8ee2bd74677280a4941c36bcd04aeb45857b53f3842b30533b62f6ff109afa3
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a phishing and trojan threat. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document's content is designed to trick users into installing malicious browser extensions or updates. Multiple external URLs are present, likely serving as download sources for further payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://gimoguvi.ru/award?keyword=sociology+as+a+science+essay+pdf PDF link annotation
    • http://clubstore.pro/fexexugemilutomozubadekm2sb.pdfIn PDF document text
    • http://study-english-05.site/supesibafifbac4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366632/normal_600131287c7e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495409/normal_603d37561dc3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423166/normal_5fe9ce5c19343.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/0c30bca0a6a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378157/normal_5ff7724455cf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489839/normal_5fd665d225951.pdfIn PDF document text
    • http://mini-cam1.club/xasubomjr7r3.pdfIn PDF document text
    • http://minuette.me/getting_started_with_spring_framework_j_sharma_download53xe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499023/normal_5fd93c9ab6b19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366011/normal_6004a9ec2e0b0.pdfIn PDF document text
    • http://good-production20.site/ludijis6azgr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459785/normal_602c04b6865dd.pdfIn PDF document text
    • https://luvokivimowef.weebly.com/uploads/1/3/1/6/131607407/3188299.pdfIn PDF document text
    • https://bawosizegidaw.weebly.com/uploads/1/3/1/4/131411147/7cdfde0a.pdfIn PDF document text
    • http://business-open.online/how_to_start_fluval_406sqoob.pdfIn PDF document text
    • http://fito4ka.xyz/army_weapons_qual_regulation2m5bp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d33b8dfc-9792-4d26-9d81-613d0bd32a71.filesusr.com/ugd/d34367_c852170da5e04813a186e93ee0d940e5.pdf?index=trueIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_999be9b32c114568a83389b0053fbd88.pdf?index=trueIn PDF document text
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_0f41dcfed9fd457aa895105e6ba9e4b3.pdf?index=trueIn PDF document text
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_b7cade5a0b1d452cbe6d4f2faf7c8a01.pdf?index=trueIn 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_off0000fac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC4 5432 bytes
SHA-256: 0a7ba82b2b6f934e63d65fcf29e4226e1a4aea06b2a77cce800888b03c78eb41
font_01_sfnt_off00010d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D61 11852 bytes
SHA-256: 8cffbfa02b6ff1326b9f5ca0f8abf49fff684a09d490e0345fd4664a29009ee8

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