Malicious PDF — malware analysis report

Static analysis result for SHA-256 f505880ceff5d360…

MALICIOUS

PDF

72.6 KB Created: 2021-01-25 05:16:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b9e6f3b0149b1652caedf7724cac56a1 SHA-1: ece1a90f46e0f3e1c2d032235e9d6327780a24bb SHA-256: f505880ceff5d3609b0cd97cbc812a69db0cc2bf41fe42c94116e2e36d324e1f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly-hosted PDFs, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URL and the PDF link farm heuristics confirm the primary attack vector involves directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/123?utm_term=donna%2527s+grandad+doctor+who PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461770/normal_600b03df9a03f.pdfIn PDF document text
    • https://bifugojatomawak.weebly.com/uploads/1/3/1/4/131437093/d7fec73da2.pdfIn PDF document text
    • https://bipufufutugudov.weebly.com/uploads/1/3/1/1/131164095/xenozolove.pdfIn PDF document text
    • https://latiratigu.weebly.com/uploads/1/3/1/1/131164156/5230640.pdfIn PDF document text
    • https://sufotope.weebly.com/uploads/1/3/0/7/130775917/dapedirudola.pdfIn PDF document text
    • https://menaminalopu.weebly.com/uploads/1/3/5/3/135318725/1260445.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/kifapifezoxevok_zakudi.pdfIn PDF document text
    • https://fibunijir.weebly.com/uploads/1/3/0/7/130740490/5357948.pdfIn PDF document text
    • http://pifozuvarivin.22web.org/infatuated_jesus_honcho.pdfIn PDF document text
    • https://jositaloj.weebly.com/uploads/1/3/4/0/134042718/5938879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473638/normal_5fe81147de40f.pdfIn PDF document text
    • http://rorezorejadij.iblogger.org/bethesda_system_for_pap_smear_reporting.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463552/normal_5fe6d6f010bec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367013/normal_5fc6137da38d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pixuxurarosu.epizy.com/column_addition_and_subtraction_worksheets_ks1.pdfIn PDF document text
    • http://kuzadimizu.epizy.com/rational_inequalities_questions_and_answers.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_off0000e148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE148 5292 bytes
SHA-256: f4360fe1eea52981ce009edc86c7107200d89d79cf34b98ecfdf836aa2b586d3
font_01_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 10076 bytes
SHA-256: 2d250d260ff2b0e4149ddd656f71154bbf1c9fe520e600a9d7def42db94827d3

Open this report in the interactive analyzer, or submit your own file for analysis.