Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7571bb59b36a6b…

MALICIOUS

PDF

69.5 KB Created: 2021-02-14 15:44:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d2b92b044100873bb4e5ccf8e95ca3a2 SHA-1: 14b8171457863a25b4602b6acb1c913a0a4b761e SHA-256: 6a7571bb59b36a6b9c21c756d45fd6ee13606e0fb0dfa3275ff205a9e2eb8c7b
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, with a high-confidence heuristic identifying it as a link farm on disposable hosting. The primary malicious URL, https://crophysi.ru/123?utm_term=rise+up+gamers+copypasta, is directly referenced by a PDF_URI heuristic. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and URL usage strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=rise+up+gamers+copypasta PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413707/normal_6029267b619d3.pdfIn PDF document text
    • https://cdn.sqhk.co/fivufotimad/ENRgdjj/final_fantasy_viii_walkthrough_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/jfpp5hf/smarter_brain_training_and_mind_games_app.pdfIn PDF document text
    • http://gigewaxupupixe.22web.org/gotuvogaxufebikano.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/a50DGUO/extreme_landings_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/nanijamu/et9CidK/mavuxazawina.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/XifHuif/my_dog_tries_to_eat_a_frog.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/jirebonudur/47798472101.pdfIn PDF document text
    • http://zevizajezu.epizy.com/xomimorarunavovanokifi.pdfIn PDF document text
    • http://nupifikitove.epizy.com/38137206538.pdfIn PDF document text
    • http://jufofokisib.epizy.com/96998101934.pdfIn PDF document text
    • http://bidemuv.rf.gd/gta_3_aptoide_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/chaar_sahibzaade_songs_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/97596653438.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_off0000d1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D1 5332 bytes
SHA-256: 2e0c731ec945e2530c5ef30a9d8da7083bca57b9ba6634e3b4115ee5f7b45c37
font_01_sfnt_off0000e3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 11060 bytes
SHA-256: 96acc5927042ee62a2684cc24202407717a7c23efb3e6d4fd80e1915e70b8e76

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