Malicious PDF — malware analysis report

Static analysis result for SHA-256 f088794f2f26b56b…

MALICIOUS

PDF

69.7 KB Created: 2021-02-28 13:12:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ead9887989e77a92aeca9fc0db613078 SHA-1: 4cf515596c14eb9031859852c8a4807877c4d341 SHA-256: f088794f2f26b56bff97d847b4c5d8926e13940df13dcdc9e809dc6ff0f92c09
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a potential phishing or malware distribution point. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain metadata related to the PDF's creation, but the primary malicious activity is driven by the external links.

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://xajibur.ru/strik?utm_term=community+mental+health+psychologist+salary PDF link annotation
    • https://zokibiruxe.weebly.com/uploads/1/3/5/3/135326092/3229721.pdfIn PDF document text
    • http://medgaj.com/assassin_s_creed_unity_dead_kings_ps4er5k1.pdfIn PDF document text
    • https://zuvoxowiton.weebly.com/uploads/1/3/0/8/130813332/gutidijugevemite.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/jd2ggrH/how_to_change_my_voicemail_pin_on_iphone.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/laponubutef1ul1.pdfIn PDF document text
    • http://virnet77.ru/4155962408ed1nb.pdfIn PDF document text
    • http://paksorond.xyz/vice_news_jobs_usao7i8d.pdfIn PDF document text
    • https://vebokupamo.weebly.com/uploads/1/3/4/4/134494409/93c58d3ed042f2.pdfIn PDF document text
    • http://wirobigi.medianewsonline.com/kufivatolevonudefefeto.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/jivala/baldi_s_basics_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/jesinuwozomipavaxonuja.pdfIn PDF document text
    • http://zadizufosa.rf.gd/warrior_leveling_talent_guide_classic.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/la_la_land_piano_sheet_free.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_off0000d311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD311 5352 bytes
SHA-256: 53b4995225bf329ff8e983a524f245cc162193fe5b5fb995bcb8db64823bc839
font_01_sfnt_off0000e524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 10652 bytes
SHA-256: 8ba830464d12513a5c40e744f86381232d3ec08b28e7efcc026bd64584dd56dc

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