Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4aa5923aeb119d…

MALICIOUS

PDF

72.4 KB Created: 2021-01-28 08:02:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 739ae78f805479059ec42ba5d69397ac SHA-1: e23902705c860fec037961996dc5a255e09b3d7a SHA-256: dd4aa5923aeb119dd77adeb9eac85e9ed226bec4241dee2f1afe3ec2f51784d8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of a 'utm_term' parameter in one of the URLs indicates a potential phishing or SEO manipulation tactic. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=georgia+probate+forms+cobb+county PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450421/normal_600ecb56cbcc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445337/normal_5fe8e969d5867.pdfIn PDF document text
    • http://nat-fru.space/anthony_giddens_essentials_of_sociologyx35rh.pdfIn PDF document text
    • http://labiosdewonda.com/wotexebojojunedugulitivun40i5.pdfIn PDF document text
    • http://bubble1.space/52935074268z5ddj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443610/normal_600b9af2419a0.pdfIn PDF document text
    • http://dle-tpl.site/fipafanefews1gpi.pdfIn PDF document text
    • https://rudixesawemes.weebly.com/uploads/1/3/1/1/131163949/c10ea2d75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455670/normal_5fd1e891397a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465149/normal_5fd7d76d4070b.pdfIn PDF document text
    • http://mandarin-fruit.space/best_funny_videos_ever_in_the_worldwyz8w.pdfIn PDF document text
    • http://mnclassis.org/scanner_radio_fire_and_police_scannerzycwd.pdfIn PDF document text
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/4fac600.pdfIn PDF document text
    • https://favasonod.weebly.com/uploads/1/3/2/7/132740296/xezojarexex.pdfIn PDF document text
    • http://badgesverified.com/xesigqkdr2.pdfIn PDF document text
    • https://bobefadapuxat.weebly.com/uploads/1/3/4/8/134858353/dunobudasetosaba.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/fowikorejodi/mexapakudurutupujetib.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_off0000dbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 5576 bytes
SHA-256: 1f0b3943e177766936245c673377fc0b7e13b71e53fa63e87c804aa7e3ffdb4d
font_01_sfnt_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 10976 bytes
SHA-256: f27a3f9824d346a10815186324f8e7c9632bc3d3c864314e3d834498657f84b4

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