Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1514e3056153c1…

MALICIOUS

PDF

75.1 KB Created: 2021-03-31 19:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 521c40ad62114aa16015cb963efb1df9 SHA-1: 68cec97691243d50dcd6b94e5b63423ad0905ac2 SHA-256: 5b1514e3056153c14060a5266825167387bc93a08599bac9e8405dc77ee32105
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, with at least one, 'https://fokemale.ru/award?keyword=microsoft+excel+vlookup+formula+pdf', being flagged as suspicious and likely serving as a lure. The document body, though heavily obfuscated, suggests a deceptive pretext related to 'Microsoft excel vlookup formula pdf'. No scripts were extracted, but the overall structure and URL distribution point towards a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/award?keyword=microsoft+excel+vlookup+formula+pdf PDF link annotation
    • https://cdn.sqhk.co/kisoxukapab/hbeie8p/kugonofopuzobaxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475737/normal_60121793e534d.pdfIn PDF document text
    • http://gefejisu.22web.org/dinesh_chemistry_class_9_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486552/normal_5fcc1b0392808.pdfIn PDF document text
    • https://cdn.sqhk.co/felibepudu/jgjifLI/bogozalinemakebawaso.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/ewshcjc/tedivuvewubigudidifiver.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404514/normal_600f203246b9e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joriboka.epizy.com/clustertruck_free_2018.pdfIn PDF document text
    • http://sivopob.epizy.com/37218660597.pdfIn PDF document text
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_78277e0ec6a64a3391066285fc607f5e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f29a097c-20aa-4db5-ba04-ec2a3b51b2cf/what_does_non_clinical_significance_mean.pdfIn PDF document text
    • http://jesuwipefeg.rf.gd/15686531954.pdfIn PDF document text
    • http://fikikozazilut.rf.gd/dasij.pdfIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_a5b0807f9afd467084a977d40e9dd8dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/889341cc-eb44-49dd-9e12-96b9d0191355/jakenutudalogajokuzuma.pdfIn PDF document text
    • http://vudemiziwifimo.epizy.com/precalculus_word_problems_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e4175e6-afba-4a3b-8d76-ef1a2594f4b0/la_hobito_esperanto_epub.pdfIn PDF document text
    • https://6438efa2-cbc3-4905-bec7-85cdafd94a34.filesusr.com/ugd/d1cf8b_f1eb6d318d394a17af29afe8ae86c595.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d57a662-dbd1-46b6-b3bf-ea89b2d28060/singer_simple_sewing_machine_thread_bobbin.pdfIn PDF document text
    • http://wawaxibog.rf.gd/guxaluwinuw.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_off0000e557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE557 5500 bytes
SHA-256: e54ad6b1796f1cb2cd257c365e400c7d7cb9eaf2ec7cf3a7b48e2ec12a1506be
font_01_sfnt_off0000f80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80B 11732 bytes
SHA-256: 6de498535746caa7d37237b2fcf50bd108ccdba6e32caac6161699e6b2de29bd

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