Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c116e7417c43047…

MALICIOUS

PDF

75.4 KB Created: 2021-05-11 02:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3d480a260949dea667fbe001697ae953 SHA-1: caaf1a7b2f2fa9e2d97766aabdc0a192a36e74ba SHA-256: 8c116e7417c43047a63dea4e087b3e3a33af86b81df90f3a5a151c8ac52e48da
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO spam campaign, likely delivered via spearphishing.

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://midufefew.ru/strik?utm_term=are+tarot+cards+easy+to+learn PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489595/normal_6034d1397b315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480589/normal_601875e3ae6fb.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/6522642545642wzs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470211/normal_5ff40774baac6.pdfIn PDF document text
    • http://kefisofelipado.22web.org/doxozunovurakat.pdfIn PDF document text
    • https://gunobome.weebly.com/uploads/1/3/1/3/131398345/rerurazuse-tupijuvupiruve-mukub-vugejutagerisak.pdfIn PDF document text
    • http://mazers.fun/92516868823xlape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418566/normal_5fd652f4d37a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425492/normal_5fd3772ec9acf.pdfIn PDF document text
    • https://bokesaxigalul.weebly.com/uploads/1/3/0/7/130776824/seger.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370560/normal_5fe936a69289a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413231/normal_605893d8ed63d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a742af3-190a-4ba6-82fa-d78c195618ea/59592270875.pdfIn PDF document text
    • http://zuzenif.rf.gd/present_perfect_simple_exercises_intermediate.pdfIn PDF document text
    • http://magovinirubow.epizy.com/lukoz.pdfIn PDF document text
    • http://jidoreno.epizy.com/desago.pdfIn PDF document text
    • http://seropurubok.epizy.com/how_long_does_serta_icomfort_mattress_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d610f6ff-cb32-4129-b99b-b922c8f8de27/wevetipodizirinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cc5191a-d878-4c4b-9825-3f4061bbc110/38619459666.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b06fe891-8a72-4535-891d-680ba5faa781/miberujabejusuru.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_off0000ea85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA85 5024 bytes
SHA-256: f82e0b230351400316458facdca1170686a340b04bcc3956efb61e86a7e81594
font_01_sfnt_off0000fbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAB 10848 bytes
SHA-256: 7f34986de0707a4ee22c3345c1253a8ae3d2fa7601314268d5b27fa6a7b358d6

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