Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f9dd67978bc8c5…

MALICIOUS

PDF

79.4 KB Created: 2021-01-31 20:44:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 10ba42bf3e23fb4b1a45ff72ec047f60 SHA-1: e2a675c3aae02c347f23560644d6b69ff7291872 SHA-256: d8f9dd67978bc8c5f77e92b4a5a36ad86640e62832583d775eb5534bc8a8ff16
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 hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to lead users to potentially harmful content.

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://druttle.ru/123?utm_term=study+guide+for+ephesians+6+by+david+guzik PDF link annotation
    • https://bitipobigexu.weebly.com/uploads/1/3/5/3/135399459/bizibamo.pdfIn PDF document text
    • https://waxukazo.weebly.com/uploads/1/3/1/0/131071095/padoliwuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404515/normal_5fc67a0d8e86b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417658/normal_600f3aff300d9.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/mjhzTyZ/latest_viral_video_of_girl_2020.pdfIn PDF document text
    • https://xonarupitowij.weebly.com/uploads/1/3/4/6/134617661/2249884.pdfIn PDF document text
    • https://feropozu.weebly.com/uploads/1/3/1/4/131454035/xidijid.pdfIn PDF document text
    • https://muwewemumefiga.weebly.com/uploads/1/3/0/8/130874681/tutorimol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jojudodadanu.epizy.com/murmur_diphthongs_worksheets_for_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/xazizakoxosujasele.pdfIn PDF document text
    • http://goseletew.epizy.com/bamuvagokudalubek.pdfIn PDF document text
    • http://debagejusuwaj.epizy.com/21040290674.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_off0000f85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85B 5944 bytes
SHA-256: 81ce081027f6398f258bd9048877f0dfb00a4190835c183b50fe98874abb6940
font_01_sfnt_off00010ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA7 10572 bytes
SHA-256: b4df7a1d586846b148149c71192fbda21fcf3385ded7d0c10d9268cd206fdf00

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