Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6760d4911a936a…

MALICIOUS

PDF

86.7 KB Created: 2021-01-22 19:03:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: be75ec40ef7f1b168bccedb0a5162e71 SHA-1: a8561122f7e21f33f16bbcc166ade3af553db58a SHA-256: 6b6760d4911a936af4360134172b5bf9e948105f63a5007e0d775cea640ceb88
126 Risk Score

Malware Insights

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

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://bologen.ru/123?utm_term=an+example+of+identity+foreclosure+is', suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://bologen.ru/123?utm_term=an+example+of+identity+foreclosure+is PDF link annotation
    • https://site-1168109.mozfiles.com/files/1168109/zuwixuwebebobamapolog.pdfIn PDF document text
    • https://novomuzedideb.weebly.com/uploads/1/3/1/4/131406537/logamodigetenuf.pdfIn PDF document text
    • http://limevekobo.iblogger.org/blend_synonym_formal.pdfIn PDF document text
    • https://site-1177263.mozfiles.com/files/1177263/jelegevokiseru.pdfIn PDF document text
    • https://zimuvudiredefux.weebly.com/uploads/1/3/2/7/132710782/pisulogobotagapusubo.pdfIn PDF document text
    • https://site-1168401.mozfiles.com/files/1168401/alone_season_6_cast.pdfIn PDF document text
    • https://site-1184420.mozfiles.com/files/1184420/72466297003.pdfIn PDF document text
    • https://kasewipiliri.weebly.com/uploads/1/3/4/9/134901701/5527754.pdfIn PDF document text
    • https://site-1084156.mozfiles.com/files/1084156/nawozejupewuzokiji.pdfIn PDF document text
    • https://site-1232793.mozfiles.com/files/1232793/bobavufanizusizexop.pdfIn PDF document text
    • https://site-1175953.mozfiles.com/files/1175953/free_bubble_puzzle_games.pdfIn PDF document text
    • https://site-1168501.mozfiles.com/files/1168501/lotixemoseripubejujezop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fegidil.rf.gd/sezatuxugomameralufelip.pdfIn PDF document text
    • http://zetesapoxus.epizy.com/malabomegemoneb.pdfIn PDF document text
    • http://zimunumiwu.epizy.com/wituz.pdfIn PDF document text
    • http://jirizaxewusi.epizy.com/andres_caicedo_cuentos.pdfIn PDF document text
    • http://komewubot.epizy.com/dd_national_old_serial.pdfIn PDF document text
    • http://vofolosozoz.epizy.com/bootstrap_icon_fa.pdfIn PDF document text
    • http://bufalirafuma.epizy.com/57894699159.pdfIn PDF document text
    • http://sobikunukozi.rf.gd/72928041841.pdfIn PDF document text
    • http://zonisitis.rf.gd/26883021998.pdfIn PDF document text
    • http://mugosovexu.epizy.com/jepepanusu.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_off00011676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11676 5460 bytes
SHA-256: cefefd47b2e8b72f71815d941bff357ea3c76488e00234614a9b826cd5c96fe3
font_01_sfnt_off00012904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12904 10668 bytes
SHA-256: 9e4172966012f6b7ee92267690338f065f77fcf437e804e043230110e450913a

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