Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ad0937dbabb08e…

MALICIOUS

PDF

77.3 KB Created: 2021-02-16 00:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 343c503f2ce983f59760d51d55c922ad SHA-1: 52e495466a300e6e5686f68c559dab5fe8d6ad57 SHA-256: 65ad0937dbabb08e8f10e1284edd8b19c752d7cf672e6344f24dc1e857c65042
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The document body, though heavily obfuscated, appears to be a lure related to puppy adoption, which is a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=miniature+dachshund+puppies+for+adoption+in+texas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365539/normal_6014e901c6047.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_601c69dbc1ca3.pdfIn PDF document text
    • https://rakulemiz.weebly.com/uploads/1/3/2/6/132682689/f4ea34df3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417827/normal_5fe0822c2553d.pdfIn PDF document text
    • https://zatalabevixet.weebly.com/uploads/1/3/2/7/132741241/154716.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408587/normal_600737c4ad66d.pdfIn PDF document text
    • http://raxebazidalorow.22web.org/44019282394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487416/normal_6015699608494.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/6ibjaih/gopigo.pdfIn PDF document text
    • https://jowujutaxafekul.weebly.com/uploads/1/3/5/3/135348014/1ea4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://diwomikutaz.epizy.com/codominance_worksheet_blood_types_spongebob.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/xovarexut.pdfIn PDF document text
    • http://wulukexererumus.epizy.com/delhi_belly_full_movie_1080p.pdfIn PDF document text
    • http://mogadaf.epizy.com/dawipajozaw.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/1270559002.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 5168 bytes
SHA-256: ef348aa80abf67dbba2bcf41eff39f8cad4f5dbc038d4de630a62e0941a5f3d9
font_01_sfnt_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 10848 bytes
SHA-256: b56d50b8229c2101cad52e7238bc8e6b36c6de6c261b46cb453cba2575138009
font_02_sfnt_off000119a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A4 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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