Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd9b01d1e1add10…

MALICIOUS

PDF

121.8 KB Created: 2021-03-22 22:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b9001b75e7e1a3aac13a8424c4b87388 SHA-1: b801c7e7fd2be62154ea76cd613fa0bdf4a8f203 SHA-256: 1fd9b01d1e1add101653636c4b6ecd3ceb060d18c8076dfd33a51bbf881874e5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for SEO manipulation or to distribute further malware. The presence of numerous external links, including those with UTM parameters, points towards a phishing or malicious redirection scheme.

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://zajinet.ru/strik?utm_term=husqvarna+gt52xls+owners+manual PDF link annotation
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/4aba67043.pdfIn PDF document text
    • http://tometifo.getenjoyment.net/airwell-fedders_ac_age.pdfIn PDF document text
    • https://dodupezuvu.weebly.com/uploads/1/3/4/4/134443873/3a3e41.pdfIn PDF document text
    • https://nokivuvaxeg.weebly.com/uploads/1/3/4/5/134594014/899974e4a1e0c8.pdfIn PDF document text
    • http://netopodimamo.mywebcommunity.org/89840132736.pdfIn PDF document text
    • http://larebalin.mypressonline.com/the_warrior_diet_food_list.pdfIn PDF document text
    • https://jenajurowob.weebly.com/uploads/1/3/1/4/131408252/desidebeguk-doxepefuguwi.pdfIn PDF document text
    • https://baxezakeva.weebly.com/uploads/1/3/1/4/131406046/neran-vutitogepoxezax-gagarow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481671/normal_60212bca6d59d.pdfIn PDF document text
    • https://gugajapu.weebly.com/uploads/1/3/5/3/135330564/fitedoneraxopi_xogor_zapidaf.pdfIn PDF document text
    • https://difidewuwigexej.weebly.com/uploads/1/3/4/6/134652805/adeaae56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374177/normal_5ffdfc7980099.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://purezaviwof.myartsonline.com/bacterial_analysis_of_water.pdfIn PDF document text
    • http://kikanelomer.onlinewebshop.net/technical_oral_communication_definition_advantages_and_disadvantages.pdfIn PDF document text
    • http://litorow.myartsonline.com/44332160244.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_off00019e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E51 5568 bytes
SHA-256: 3e34c81045151f8f2271b7438fe180a8b8d057e1afc00dee6fc4d0330a34c00f
font_01_sfnt_off0001b14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B14A 11972 bytes
SHA-256: 76a667719e8abaec3ba4f86a5e3a616ae2b572521d52812c80b25231f31cded2

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