Malicious PDF — malware analysis report

Static analysis result for SHA-256 0720f4c555f589be…

MALICIOUS

PDF

75.2 KB Created: 2021-04-05 22:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 539ee9a8a0b08484ea2161e39efa1ab0 SHA-1: dbf4c60676347d4e99d11a3e7622b1ae53c22d61 SHA-256: 0720f4c555f589be68bd5ddaaa54ed5dc1cca3b3647ad5e1953742ac4dd6f56e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external sites, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of external URIs suggests an attempt to redirect the user to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://golowaki.ru/wix?keyword=go+launcher+z+apk+download PDF link annotation
    • https://tewutenuka.weebly.com/uploads/1/3/2/6/132695339/5838329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417535/normal_6022aaa1a7d08.pdfIn PDF document text
    • http://itdiscounts.info/are_anker_products_any_good1375f.pdfIn PDF document text
    • http://mereritijazos.scienceontheweb.net/rutamixo.pdfIn PDF document text
    • http://trysucre.pro/metodologa_de_la_investigacin_sampieri_2018hu7yx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_605f3e26ba436.pdfIn PDF document text
    • http://gebigulexejo.sportsontheweb.net/31670453233.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/jupovuxusulelilof.pdfIn PDF document text
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/suwuxaxufixetel.pdfIn PDF document text
    • https://kabibejago.weebly.com/uploads/1/3/6/0/136050231/861314.pdfIn PDF document text
    • http://chambreop.xyz/34101927735fxv1z.pdfIn PDF document text
    • http://doweryklkq.space/murumivavodomu54i.pdfIn PDF document text
    • https://bevabuje.weebly.com/uploads/1/3/4/8/134897483/7850480.pdfIn PDF document text
    • http://bioforcecolumbia.site/what_are_examples_of_cooperative_learning_strategies6yn5x.pdfIn PDF document text
    • http://matteset-spon.space/378125183165ti6u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jokosen.atwebpages.com/72718492855.pdfIn PDF document text
    • http://tovujopojat.epizy.com/deziwevekuxurolutif.pdfIn PDF document text
    • http://tuparibuju.atwebpages.com/oxford_picture_dictionary_free.pdfIn PDF document text
    • http://xugonowelimije.epizy.com/gejala_asidosis.pdfIn PDF document text
    • http://zuzidonul.epizy.com/intensity_dean_koontz_review.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE624 5220 bytes
SHA-256: 87376ec95f12dcb10354727b82c40e4e455b585aa62e49f9e512142afe77c1f6
font_01_sfnt_off0000f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FA 11796 bytes
SHA-256: 8f8b06c04d9262d257deac045e7850950f9b817834e4f5643b81ed07858b9629

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