Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79df2ab03bba0cd…

MALICIOUS

PDF

69.9 KB Created: 2021-01-13 04:07:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c7f9251444e40f1c775157486e5dd012 SHA-1: d7f90324a884ef083dfcf3925376429f158a711c SHA-256: f79df2ab03bba0cd19dcbd3dd771e9e597b680e3274ee9f3ef3c12c6b603dd86
252 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a significant number of embedded links pointing to various disposable domains and redirectors, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of a 'download button' lure further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/123?utm_term=pasco+county+building+department+forms In PDF document text
    • https://cdn.sqhk.co/dajebala/jfkxja5/speaker_boost_for_laptop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479923/normal_5fcd72d552938.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/waxojug.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/5ViCoN6/59334505855.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/qhibnia/original_3d_crystal_puzzle_skull_step_by_step.pdfIn PDF document text
    • https://pivazadigemeza.weebly.com/uploads/1/3/4/6/134642233/699220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f92517978a6e.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/S2ijge5/32079135722.pdfIn PDF document text
    • https://cdn.sqhk.co/sezelijimofi/ghicLii/ewallet_definition_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/ynKhchc/family_50_games_compendium.pdfIn PDF document text
    • https://mopepeserowote.weebly.com/uploads/1/3/4/6/134621402/2451bc18fe8.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/zabodo.pdfIn PDF document text
    • https://domamulobam.weebly.com/uploads/1/3/4/5/134527142/fumoxovapebunupelo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53A 5720 bytes
SHA-256: 813e9b84d5bfc8e3023dbda06a1d95467f9e238e732f6e5ad2c049c3f83ea028
font_01_sfnt_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 10000 bytes
SHA-256: 38aa5878ef31de3f0c70796266d8fc1266ae47438a56542a2ccea1df792bc00a

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