Malicious PDF — malware analysis report

Static analysis result for SHA-256 45fb32c1aea4aecf…

MALICIOUS

PDF

71.1 KB Created: 2021-01-18 15:20:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 01347a9770a931a8b7cbfe33ddb9cdb9 SHA-1: 761aa569c05bef11bd8268c328f80f0b775c9be1 SHA-256: 45fb32c1aea4aecf91cd87858f8503df8db5a88e59504d1dbd95000344af1772
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains text related to search terms, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/123?utm_term=rose+bowl+seating+chart+rolling+stones PDF link annotation
    • https://cdn.sqhk.co/gugirejol/ieKSy86/sutegamajuwajexaluzota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f8fca9034941.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485434/normal_5fffeb20173b0.pdfIn PDF document text
    • https://natedutaz.weebly.com/uploads/1/3/4/8/134850225/dusos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464068/normal_5feb0184a5fed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://varoniwarovez.rf.gd/pamiwagoxosuwosowofetev.pdfIn PDF document text
    • http://buwomonemagup.epizy.com/41796637025.pdfIn PDF document text
    • http://naxokagad.epizy.com/44099883019.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/a_wrinkle_in_time_books.pdfIn PDF document text
    • http://kutepiguzusudax.epizy.com/kambi_kadha_malayalam_2017.pdfIn PDF document text
    • http://fopagozijudiri.epizy.com/manualidades_para_navidad_con_papel_aluminio.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_off0000d5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D4 5300 bytes
SHA-256: d276edec76a1d0cfad674a2394c07d000d442d1287174de0af5700070dd1fe43
font_01_sfnt_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 11524 bytes
SHA-256: 2fc31190aa91ba445e623d9a1d1aa0c72517915a76ffa6ae87e7f052e66d24e6

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