Malicious PDF — malware analysis report

Static analysis result for SHA-256 753204d7c89e5781…

MALICIOUS

PDF

76.8 KB Created: 2021-06-06 07:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3a200ed6d8c795a6fc1ac69c67e68334 SHA-1: 52a8ad39a62fa0c42d1b2bc50e321b6a6cade4b0 SHA-256: 753204d7c89e578185e1c84afea04d148a807ba0e8c96b94602ead3a133d8416
194 Risk Score

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 ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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
  • 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://ketchas.ru/pbw?utm_term=masks+of+nyarlathotep+7e+pdf PDF link annotation
    • https://lumekagaxegi.weebly.com/uploads/1/3/2/7/132712489/f22457.pdfIn PDF document text
    • https://tunivarururi.weebly.com/uploads/1/3/4/0/134041149/2126119.pdfIn PDF document text
    • https://widajuzuno.weebly.com/uploads/1/3/1/6/131637349/wajate.pdfIn PDF document text
    • https://guvopizap.weebly.com/uploads/1/3/0/7/130776702/sisikoduzida.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4408461/normal_60b5530a8859e.pdfIn PDF document text
    • https://kigivagup.weebly.com/uploads/1/3/4/3/134396191/lonaxowixux_bebumeniko_tumizagevabili.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393898/normal_605402867e1b7.pdfIn PDF document text
    • https://bojotipawotos.weebly.com/uploads/1/3/2/6/132681617/3edc93c6a.pdfIn PDF document text
    • https://kivenawuvu.weebly.com/uploads/1/3/1/1/131163776/nomimufuwe.pdfIn PDF document text
    • https://tilivugex.weebly.com/uploads/1/3/4/1/134108965/db3cdbbf5.pdfIn PDF document text
    • https://tofavasexivefet.weebly.com/uploads/1/3/4/5/134578877/nuzekejul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zilebunod.pbworks.com/f/poridipob.pdfIn PDF document text
    • http://dewubuk.pbworks.com/f/midodametak.pdfIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144563484/42678693910.pdfIn PDF document text
    • http://pijipusap.pbworks.com/f/what_is_an_inbreeding_coefficient_in_dogs.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/f/52061080143.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_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 5380 bytes
SHA-256: 6577535465065804ef3b2b70616afb31416a2781f47ec834619f701437e6f4f1
font_01_sfnt_off0001019e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019E 10820 bytes
SHA-256: edaa9b600112ea1bac8b07fcbc4e85025bf69674a39a89d794db4a2e9cce99bc

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