Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad7591c67ddf9d4…

MALICIOUS

PDF

77.9 KB Created: 2021-01-22 12:36:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7ffaed5adfaeaefe3919a1778046cd6c SHA-1: 9de8865d7326025c8597244a52b9fcb712033bc2 SHA-256: 5ad7591c67ddf9d4a62b4fa23709daf0b3d5494d4d9bcdc488236184ff4e17a8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and a lure related to 'my singing monsters apk unlimited diamonds'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=my+singing+monsters+apk+unlimited+diamonds PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413007/normal_5ffa01047e035.pdfIn PDF document text
    • https://nokesopupikes.weebly.com/uploads/1/3/4/7/134767934/dobiwubumaxuz_bajebafuze_tizanulu.pdfIn PDF document text
    • https://cdn.sqhk.co/xedogigiloli/jgeFojh/fruits_vegetables_and_nuts_high_in_iron.pdfIn PDF document text
    • https://cdn.sqhk.co/rotelizedo/idAfsij/one_gold_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445337/normal_5fd658ec37440.pdfIn PDF document text
    • https://subafoxa.weebly.com/uploads/1/3/1/3/131379179/4600815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_5fd726896c657.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/eYja8ip/zaviri.pdfIn PDF document text
    • https://dulipitigisol.weebly.com/uploads/1/3/4/7/134717891/1dd4b0a7fa42f15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475219/normal_5fd2e5c844ee6.pdfIn PDF document text
    • https://site-1197000.mozfiles.com/files/1197000/99190075997.pdfIn PDF document text
    • https://site-1172409.mozfiles.com/files/1172409/xejipojusavatopapi.pdfIn PDF document text
    • https://cdn.sqhk.co/sukurorezib/gihddOV/doxeratusefokenidaxojiw.pdfIn PDF document text
    • https://site-1171689.mozfiles.com/files/1171689/43162081734.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/vavebufevodutob/bootstrap_font_awesome_4._7._0.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/deed_of_sale_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/carbon_s_golden_malted_waffle_maker_manual.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_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 5452 bytes
SHA-256: ad0edabc7ed91a230e4b734937c78b6b74e4f46cdabfd28c235ce29463f79516
font_01_sfnt_off00010947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10947 9832 bytes
SHA-256: 9a36ab69305706e70446d01b0239e605e853f323db1724c45229e71efd3eaa1d

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