Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a39d05db497d82c…

MALICIOUS

PDF

86.0 KB Created: 2021-05-12 17:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9ad642c7cbec5f297c47716f808a01e2 SHA-1: 2f52046ccce75b404f397559aec95571d1c0ada9 SHA-256: 5a39d05db497d82ca080d03d0577252ca5db6230327ae6a9be0d0b29007ba57d
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically pointing to a suspicious domain 'pelibifir.ru' that is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'visual basic in html', suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pelibifir.ru/strik?utm_term=how+to+use+visual+basic+in+html PDF link annotation
    • http://insta-sale.site/30983885681i3vol.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/7526726739olr1u.pdfIn PDF document text
    • https://cdn.sqhk.co/pamavunawi/dbjhcih/indoor_skydiving_san_diego_cost.pdfIn PDF document text
    • http://kulinar2020.site/beck_youth_inventorytn6cu.pdfIn PDF document text
    • https://sinekaku.weebly.com/uploads/1/3/5/9/135964305/zerevimezodaseruti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485156/normal_604ca15cc262e.pdfIn PDF document text
    • https://purubagenipobeb.weebly.com/uploads/1/3/1/3/131398544/673615.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/mjc4ies/tojerufirigugosenikusut.pdfIn PDF document text
    • https://dotelotud.weebly.com/uploads/1/3/4/6/134696787/tuziter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413013/normal_5fdb2b3272e99.pdfIn PDF document text
    • http://zahlungsservice-ch.site/livro_de_coquetelarial140v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_601481b719c88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404488/normal_604986c74c593.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/hr9OAjg/sonic_bomb_alarm_clock_for_sale.pdfIn PDF document text
    • https://fivujage.weebly.com/uploads/1/3/4/3/134316273/6243591.pdfIn PDF document text
    • https://lafadulow.weebly.com/uploads/1/3/4/5/134591129/buvizarik_sejimatiziwa.pdfIn PDF document text
    • http://djami.ru/gawapaqy05j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvituze.epizy.com/lojas_informatica_barreiras_telefone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0623a3a6-d293-4e80-bb95-8681385937a5/dell_precision_t5500_power_supply.pdfIn PDF document text
    • http://nasuxenabo.epizy.com/52554107284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1fb39e4-94eb-4d23-9caa-009df0551d2d/83125357716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c666933-a8eb-464c-acc9-acc9a2f94598/how_to_bias_fender_twin_reverb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26126fc-b8ce-4f86-b4cd-7ccd044a194b/lifoxo.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_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 5196 bytes
SHA-256: f299cb2adf11b3f5053527f51fda8e2490408f820869ebdfdfcee7d9efc8340f
font_01_sfnt_off0001227b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227B 11492 bytes
SHA-256: 399d8f2c754d3de1cac3f67ee5283740ddaa0089f96abc9c7b0ad7bf777f36c3

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