Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c2b6f9dfa47fe0…

MALICIOUS

PDF

75.9 KB Created: 2021-03-05 12:09:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 56f0e96ac6f6f285c7ff765f4d802e7d SHA-1: 18b864a630590b2363a29719b82947449999c13d SHA-256: 79c2b6f9dfa47fe03a22406fca6b3d8b03e6dfe43662c2c7a8dda2757ddfbc8d
244 Risk Score

Malware Insights

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

The PDF contains a large number of links designed to lead users to various websites, many of which are hosted on disposable domains or known redirector infrastructure. The heuristic firings indicate this is a malicious redirector and a link farm, suggesting the primary purpose is to drive traffic to potentially malicious sites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests an attempt to phish or distribute further malware.

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
  • 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.
  • 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://crophysi.ru/wb?keyword=the%20secret%20life%20of%20pets%202%20characters%20in%20real%20life In PDF document text
    • https://cdn.sqhk.co/jedelamodafa/hbxSgh4/80583472150.pdfIn PDF document text
    • http://snt-br.ru/true_prepaid_cardr4dx5.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/plan_de_negocios_para_la_creacion_de_un_restaurante.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/iigdeC5/word_search_maker_software_for_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/ratevusur/iHmihuW/zoforigowidupanolubikot.pdfIn PDF document text
    • http://zelolugo.22web.org/4419725617.pdfIn PDF document text
    • http://trickyturkey.com/instruction_manual_sharp_carousel_convection_microwaveughrz.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxejelun/YVgfTjj/ligudunavujes.pdfIn PDF document text
    • https://feveronibamuja.weebly.com/uploads/1/3/5/3/135300243/0b7a1d.pdfIn PDF document text
    • https://mawurimi.weebly.com/uploads/1/3/4/6/134661678/3357497.pdfIn PDF document text
    • http://temppicture.xyz/83075973931j5syg.pdfIn PDF document text
    • https://cdn.sqhk.co/wugotiparo/zjdjehj/lucky_coin_farm_terraria_1._4.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/neziruvas.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/fasudikek/centring_sheet_manufacturer_in_hyderabad.pdfIn PDF document text
    • http://godemesefiw.epizy.com/jutuvajokanuvudep.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/xozepu.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/94970030628.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/95563306549.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/tamil_wedding_invitation_editable_template.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_off0000ed3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3A 5184 bytes
SHA-256: e2df613e1c5e35c6f0fdf3e1d3cc6e510a43b46d8566f2827a03cf9684c6de34
font_01_sfnt_off0000fed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED8 10312 bytes
SHA-256: 4a11c57255ad04a5a2062b7dde22674f5fc6498ebeb05ed3cf4559f5eef85978

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