Malicious PDF — malware analysis report

Static analysis result for SHA-256 856b53cb30bc8260…

MALICIOUS

PDF

72.1 KB Created: 2021-02-15 10:56:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 16a761a7396ebd26a69ea472cd29a377 SHA-1: 83a21b1e126e47a113482779ddb0823550dc2ff2 SHA-256: 856b53cb30bc82600c5fe8ffb72578bb0851980cf498b514ae4c1198516f2a08
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a specific ML classifier and ClamAV detection. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's designed to host many links on low-reputation domains.

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://seumenha.ru/strik?utm_term=the+sound+of+raindrops+called PDF link annotation
    • https://cdn.sqhk.co/jerivudofin/hb31uii/spina_bifida_cystica_myelomeningocele.pdfIn PDF document text
    • http://shoes-storie.club/utorrent_pro_apk_apkmirror5wwtz.pdfIn PDF document text
    • https://bewevirat.weebly.com/uploads/1/3/1/4/131437926/wotigupesuwo.pdfIn PDF document text
    • https://fudanologakobur.weebly.com/uploads/1/3/5/3/135394175/4535145.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383300/normal_5fd64e7074f86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480899/normal_5fd95c435323f.pdfIn PDF document text
    • https://dapavivilo.weebly.com/uploads/1/3/4/8/134895477/guvixofamazadakebagi.pdfIn PDF document text
    • http://bupro.asia/wakefojatokupadavaboviseg2rru.pdfIn PDF document text
    • https://niwarixetawozav.weebly.com/uploads/1/3/4/1/134108921/a690f48e12.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/KSPijgg/duvefunejoji.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/hea0vB6/weekend_babysitting_jobs_nyc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471091/normal_601c72c63c4b8.pdfIn PDF document text
    • https://nixemuro.weebly.com/uploads/1/3/5/2/135299514/2884873.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/biabBgu/um_touchdown_ring_2020.pdfIn PDF document text
    • http://fbdirect.site/xuvetofosajumakutuvuzopyg0kl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dorizoki.rf.gd/alice_cooper_songs.pdfIn PDF document text
    • http://musarozopod.rf.gd/3767377499.pdfIn PDF document text
    • http://ximumipos.rf.gd/calciform_500mg.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_off0000de6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6F 5192 bytes
SHA-256: 07af8b003c1cd91afd332d57bded05a0bf4e815fb1336c12742cf5c34c273209
font_01_sfnt_off0000f011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 10408 bytes
SHA-256: 53f27c283dafd87aef8e1a877053c2bbe38e5ede12b80caedeabdd66f3ad2103

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