Malicious PDF — malware analysis report

Static analysis result for SHA-256 7707d6ef85c23200…

MALICIOUS

PDF

63.3 KB Created: 2020-11-24 14:26:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 421584c3826ab4ddab7b71b9bf6576f3 SHA-1: ea8d4ed5ec66745dd935877c318c1fe5f7736b9d SHA-256: 7707d6ef85c232000f874d853b7d3a60a5f5a6f70b8a7674320af7d8d6ca175f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/strik?utm_term=bounce+out+game PDF link annotation
    • https://lugagixoweliw.weebly.com/uploads/1/3/4/2/134234548/texigupudevefawode.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/085e8efba9fb565.pdfIn PDF document text
    • https://zulatikuwa.weebly.com/uploads/1/3/0/7/130776211/finuvavubabu_jiwigo_buwun_watik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_5fa5a35f5f5da.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/felajoxo-mosamegusa.pdfIn PDF document text
    • https://xinogibujijinak.weebly.com/uploads/1/3/4/2/134235465/2248950.pdfIn PDF document text
    • https://vebaxifi.weebly.com/uploads/1/3/4/3/134360040/sibikapa.pdfIn PDF document text
    • https://vatunumorese.weebly.com/uploads/1/3/4/8/134866462/920cdef0f1a.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/7971455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_5f8ea77f9d5fb.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/a76d7442-4b8c-45fa-aa2e-a1f0fa6d26a1/84998087.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/i_94_traffic_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d25240f-d898-4f27-a6d1-7d5de0f11d00/nikomo.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/article_370_in_english.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_off0000bf02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF02 4864 bytes
SHA-256: 93c6aab414e75e4e18b4397c0831eb98e5e7957eb8ca5cc5f8f0a22cb1c491a2
font_01_sfnt_off0000cf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF82 9692 bytes
SHA-256: 6d08488bb252cb7e4c7b10a0089fe83281ab84e377ba5788071484db4f7118e6

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