Malicious PDF — malware analysis report

Static analysis result for SHA-256 2799fdde49b481a4…

MALICIOUS

PDF

77.5 KB Created: 2021-02-18 22:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 99f7352538b254b3fbab14017586450e SHA-1: 9049409cecbf764d1ffc00eb6e5631b2e9176124 SHA-256: 2799fdde49b481a4467fd338a76f2fc6e535e2bf668ef02c4876175b7291bd5a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://crophysi.ru/strik?utm_term=flow+diagram+shapes+meaning PDF link annotation
    • https://cdn.sqhk.co/gudopokobipa/0ghnGgc/93901353187.pdfIn PDF document text
    • https://cdn.sqhk.co/kumotuxijufu/jijejD5/61724659208.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/BhcjmRM/48030841125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488329/normal_601baa384a563.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466166/normal_600496520c0ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456667/normal_5fce866a22e59.pdfIn PDF document text
    • https://cdn.sqhk.co/dinewemilo/Dl57Ghc/metaphysics_examples_in_sentences.pdfIn PDF document text
    • http://feziweninepiv.iblogger.org/ankhon_dekhi_movie_openload.pdfIn PDF document text
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/begemanoketelubifo.pdfIn PDF document text
    • https://tezijiso.weebly.com/uploads/1/3/4/6/134690371/dujavotowujok.pdfIn PDF document text
    • https://tamexixufose.weebly.com/uploads/1/3/0/7/130739892/10a26d5.pdfIn PDF document text
    • https://worojipe.weebly.com/uploads/1/3/1/3/131382243/nufenulake-dabes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/ac_dc_definitive_songbook.pdfIn PDF document text
    • http://kofipazefoleris.epizy.com/manual_absolute_basos.pdfIn PDF document text
    • http://mipivazub.epizy.com/postal_rule_in_contract_law.pdfIn PDF document text
    • http://sagalesokalu.epizy.com/7423791830.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/ferune.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_off0000f266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 5420 bytes
SHA-256: 7e703091b5acdaeaeba39977e88a1449047b1810e7bb7be4dc9bf2e65b53575e
font_01_sfnt_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 10584 bytes
SHA-256: f4783a6eaf8c549ee6210223ffd698766a151e73cde8962bf42d78e21d60e2ca

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