Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d95267fc92ef695…

MALICIOUS

PDF

85.1 KB Created: 2021-03-07 12:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f1bc859e59dfacd39bab5f6b2a58c5d9 SHA-1: 8934070604a1c7de07e257d65d9fdd8883d44966 SHA-256: 9d95267fc92ef695e08c092da81d2fdb6bfd17ee854eede12c3add903b11c5de
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, and the ML classifier and ClamAV detection strongly support this. The document body, though heavily obfuscated, contains references to 'Xerox workcentre 7845 driver mac os x', suggesting a lure to download malicious software.

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://golowaki.ru/strik?utm_term=xerox+workcentre+7845+driver+mac+os+x PDF link annotation
    • http://christinaanddavid2019.com/75500080531cp629.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/how_to_understand_integral_calculus.pdfIn PDF document text
    • http://detonicufficiale.website/rasomukexenibamonuzajomumnl0q.pdfIn PDF document text
    • http://centerbluebadge.com/75975952927pdur2.pdfIn PDF document text
    • http://tumbaa.space/120737276hgsh.pdfIn PDF document text
    • http://thepropheticapp.com/92474129358iybhi.pdfIn PDF document text
    • http://zagavexakagin.mypressonline.com/58035188069.pdfIn PDF document text
    • http://geesecam.com/voxejabj7kw.pdfIn PDF document text
    • http://copyrightnotice-ig.com/sujukagoruduzavedukuxjdmr.pdfIn PDF document text
    • http://vizazovabula.mywebcommunity.org/86280380179.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_29a2884d59734507a6ab4126e9c267a0.pdf?index=trueIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_401314a63f434b368b16bdff0f8cc523.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/87225886062.pdfIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_5ffe40c1830b466eab939f97942295e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/27968324218.pdfIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_91c477eb04684548b2cc0dfa7ea37f96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/donake/bomebosupev.pdfIn PDF document text
    • http://tososite.onlinewebshop.net/fogazosu.pdfIn PDF document text
    • http://wororezijetixa.atwebpages.com/is_the_serenity_prayer_found_in_the_bible.pdfIn PDF document text
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_ed06416bbf844b8bae8b866d9c34ee6f.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001010d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010D 5588 bytes
SHA-256: 1cefa84e875c44a7d12a99d2ad4f7237e026db061dac96b73a4899d784b5dcea
font_01_sfnt_off00011423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11423 10840 bytes
SHA-256: 860f6647db8d77364e55139594b5e4c4f4fe43cf62df5e9e2f65484b8008e779
font_02_sfnt_off000138fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FC 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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