Malicious PDF — malware analysis report

Static analysis result for SHA-256 42fcd01215ec37c0…

MALICIOUS

PDF

71.5 KB Created: 2021-01-01 09:52:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5378310f1dcacb1f30be33d262be4f88 SHA-1: ce9ccf1cf0c8e1ba4067fe9d73a75aa567856eb6 SHA-256: 42fcd01215ec37c0c78dd5958064713c6edfbe47945f72ca66f90a6f4a16ca12
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript for obfuscation or redirection.

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://trafftec.ru/123?utm_term=francine+valli+cause+of+death PDF link annotation
    • https://tozakewa.weebly.com/uploads/1/3/5/3/135398337/f3d1b153c2.pdfIn PDF document text
    • https://cdn.sqhk.co/keliziniw/iwWghAl/fog_of_war_the_battle_for_cerberus_guide.pdfIn PDF document text
    • https://sinevojixataxer.weebly.com/uploads/1/3/4/1/134131740/5b5a56af7a44.pdfIn PDF document text
    • https://divamokavagi.weebly.com/uploads/1/3/4/8/134871471/136049.pdfIn PDF document text
    • https://semotifivunadi.weebly.com/uploads/1/3/1/3/131380295/ropazufojikamu.pdfIn PDF document text
    • https://cdn.sqhk.co/kufedefivuvu/Ugchbij/gmail_app_dark_mode_chromebook.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/nivivojesezop.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
    • https://uploads.strikinglycdn.com/files/6869d2c1-7121-4a86-893d-de21e175af5e/3603363543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f20716e2-e559-408f-83dc-62d9a66e3f0e/trapped_in_the_mirror_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44011fa5-bf05-4131-ad34-e11177aae177/4812065607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9804489-a396-4618-b8c9-1ad65848e6dd/kotor_soldier_build.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e4033ea-7e17-4999-81bc-c37b68b304a1/unity_hub_download_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e84cbd71-97ab-4581-a255-59424e00a1d2/61670481004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aa437ca-97f6-4f63-a7d7-d6833d1578fe/91926036591.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/5394554785.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4A 5008 bytes
SHA-256: cbd813f24cf75db51a26b99e8f2fd0f29911fb3ff16d6277194b240d3dd55087
font_01_sfnt_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 11332 bytes
SHA-256: 2b0349b8820dfc762a4a9668887986764cc8bb49db1437d71a207781c6e947b1
font_02_sfnt_off00010312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10312 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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