Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3687429939cb1a…

MALICIOUS

PDF

84.0 KB Created: 2021-02-15 06:49:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a78c9877b7b9053901edb61ac5348abc SHA-1: 5938ddebcf464d213a1fd2a5d42b42f5b4607430 SHA-256: 4b3687429939cb1a4f3f7de9d7c0372570c223cc15093ef17ed1c1bc1fb70ae5
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. One of the primary URLs, 'https://bologen.ru/aws?utm_term=hollywoodbets+lucky+numbers+dream+guide', appears to be a lure for gambling-related content, potentially to disguise malicious activity. The PDF structure and extensive linking are consistent with techniques used to distribute malware or engage in phishing.

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
  • 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://bologen.ru/aws?utm_term=hollywoodbets+lucky+numbers+dream+guide PDF link annotation
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/09f712f5.pdfIn PDF document text
    • https://luxabilep.weebly.com/uploads/1/3/0/8/130873941/3602870.pdfIn PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/zukevamurop.pdfIn PDF document text
    • https://nasoluludeg.weebly.com/uploads/1/3/4/4/134435301/xigamugit.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/menidonepod.pdfIn PDF document text
    • http://wowit.pro/dubomijvjlr.pdfIn PDF document text
    • https://rijadotijijani.weebly.com/uploads/1/3/4/4/134470018/8409484.pdfIn PDF document text
    • https://duwodalufe.weebly.com/uploads/1/3/3/9/133997525/fuxoburulifu_gupetibalokipir.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/hieujfo/places_to_play_with_cats_london.pdfIn PDF document text
    • https://depagolal.weebly.com/uploads/1/3/0/8/130813973/nagunulufotajut.pdfIn PDF document text
    • https://zukixemafeka.weebly.com/uploads/1/3/1/3/131398149/553336.pdfIn PDF document text
    • https://fubexomufepa.weebly.com/uploads/1/3/4/8/134850999/nataraxilubazox.pdfIn PDF document text
    • http://worldthailand.fun/23300468972b3ir.pdfIn PDF document text
    • http://thepropheticapp.com/57082604033kiusw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC5 5500 bytes
SHA-256: 8bdb44547dbe9e73c23e8d63609ed1091c0164f306b382641c825225d3dde54c
font_01_sfnt_off00011074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11074 10788 bytes
SHA-256: c478dd4094045463334439fc8bf426b76b174e4c048cc52752a3dbd76dcde80a
font_02_sfnt_off0001350b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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