Malicious PDF — malware analysis report

Static analysis result for SHA-256 a918b7bf525b0089…

MALICIOUS

PDF

77.1 KB Created: 2021-03-17 22:56:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8546c33efd930bae50f5c3dc26696f13 SHA-1: 755c4b26b86c1cfedd04ba4ccad7ffdf3b67c6c5 SHA-256: a918b7bf525b00899653ee9c2d87397ce9ae3d595ca2617e3b7e81c039e1e4c7
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous external URIs, with a high concentration of links pointing to disposable hosting, indicating a link farm designed to obscure the ultimate destination. The primary malicious URL identified is https://midufefew.ru/strik, which is likely used to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=swiffer+wetjet+refill+pads+walmart PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4448735/normal_600647388cca4.pdfIn PDF document text
    • http://tavajan.iblogger.org/mcdonalds_coupons_2019_bc.pdfIn PDF document text
    • http://cleanup-sale.site/6706408812nyix6.pdfIn PDF document text
    • http://topcreditreport.info/is_salad_high_in_carbsw63h9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449000/normal_600dde56e28eb.pdfIn PDF document text
    • http://afracheat7.xyz/81994728519hwrb0.pdfIn PDF document text
    • http://rawenspant.online/puwilaxorisi7wdc6.pdfIn PDF document text
    • http://fulisipojuzobog.22web.org/boeing_737_cockpit_layout.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/fadedosi/geographic_terms_worksheet_answers.pdfIn PDF document text
    • http://pidivatepijalaw.epizy.com/sunemijapalebajebadobular.pdfIn PDF document text
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_8e00558d298d461b9ebd2441844ff06e.pdf?index=trueIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_82caa1f682fe457689c4845a86ccb025.pdf?index=trueIn PDF document text
    • http://wewuvizab.epizy.com/40029938849.pdfIn PDF document text
    • http://jovesiresumu.rf.gd/how_to_reset_ipega_red_knight.pdfIn PDF document text
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_340039ad221449c2b7eb3f16a85ddf1d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/different_types_of_text_structures.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_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 5460 bytes
SHA-256: 90fa33e233b5daf219c8505a7cf04b9f84076ce9a7d379d7166be165debc6c2a
font_01_sfnt_off000101d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 11068 bytes
SHA-256: dfbe6edc02d28d02da6d444f36bfe433aafa312d35456dce6e910668ae40905b

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