Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5fd815d38cf36a…

MALICIOUS

PDF

66.1 KB Created: 2020-11-13 15:14:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3e00cd776fb7c4657093559f3df37e19 SHA-1: 1b08b1c7358388e167dba5d17c523714ca7564fd SHA-256: 7b5fd815d38cf36a3500998bbb8a8c466ec31368f7756d07a5a2985a0ad2d60c
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified as a link farm on disposable hosting. The heuristic firings indicate the PDF is designed to redirect users to malicious content, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to exploit users through deceptive links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=playhome+mods+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_5fac5a29c6ba8.pdfIn PDF document text
    • https://kavirozix.weebly.com/uploads/1/3/3/9/133999962/gupumiwaw_zubul.pdfIn PDF document text
    • https://femidizori.weebly.com/uploads/1/3/4/6/134684525/4415695.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/jowafutexeseso-fifoxeweto-texoj.pdfIn PDF document text
    • https://nijolajosota.weebly.com/uploads/1/3/4/6/134678148/gebamobokojute.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410216/normal_5f96a1a42dc86.pdfIn PDF document text
    • https://bivitomelonex.weebly.com/uploads/1/3/4/4/134491730/659fd85653.pdfIn PDF document text
    • https://gipavibipo.weebly.com/uploads/1/3/4/6/134654588/javujitozudalizi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_5f8ed8b3f333c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nonabafat/serukotulipodadajupar.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/87980157096.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/33580497598.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/raj_k_nooyi_net_worth.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/bujezuwidofu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE53 5552 bytes
SHA-256: b7207869042a8361f613f78ebf9025b25481efe21dfb5214a92162188b398172
font_01_sfnt_off0000c115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC115 11112 bytes
SHA-256: 73aea66ed4fc14aa3b861919e997b0280c147935723a5ae126326d702aca5cf2
font_02_sfnt_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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