Malicious PDF — malware analysis report

Static analysis result for SHA-256 af365551a0b8e773…

MALICIOUS

PDF

68.2 KB Created: 2021-02-19 20:12:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2ec23928affb0905a3b90cf237910632 SHA-1: 5e65d14b3de0d48cb0f0dc162eafbd87008ec306 SHA-256: af365551a0b8e773d60810b4e876a94327d02103b6978110a74c77de12a6329c
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a lure for search results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links on disposable hosting further supports a malicious campaign.

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://leonvi.ru/strik?utm_term=how+old+is+ahsoka+in+season+3 PDF link annotation
    • https://cdn.sqhk.co/darekomeguv/PfArgdB/modern_combat_4_zero_hour_offline_free_download.pdfIn PDF document text
    • http://artistichomesolutions.com/adobe_flash_intro_banner_maker_freeriz7i.pdfIn PDF document text
    • https://cdn.sqhk.co/kesumixom/vhghagg/25176981497.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/Uf1iigj/71895793877.pdfIn PDF document text
    • http://titonigofitazi.iblogger.org/76195257872.pdfIn PDF document text
    • http://tekesonisopo.22web.org/cyborg_she_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwagezo/fjeia7m/xizefadugujenelo.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/ghbhiVB/kingpin_bowling_norwood_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/kizusuvut/R9ohfWD/67883837547.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fufapawaxuta.rf.gd/jizapugidupedutir.pdfIn PDF document text
    • http://midusetoz.epizy.com/79716553546.pdfIn PDF document text
    • http://magajavopisili.epizy.com/clash_of_clans_guide_th9.pdfIn PDF document text
    • http://bekabugi.epizy.com/kagixefebigugozaziramu.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_off0000cf61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF61 5100 bytes
SHA-256: 89c860ff90da1c864cd606461da90dab3ccb8a9138b869f6c433e70e84b402ac
font_01_sfnt_off0000e0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 10396 bytes
SHA-256: 3401ac656849c9f49bf680de6a14d15ee436aca6d309faf6360eaeaae2021c71

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