Malicious PDF — malware analysis report

Static analysis result for SHA-256 608c0e96bfa01d75…

MALICIOUS

PDF

81.5 KB Created: 2021-06-01 04:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf482fa3094ad3349c3dfda05af0b222 SHA-1: 13839ca03f80cc45b57c74d2b2d93aac3cc9adcf SHA-256: 608c0e96bfa01d75278be68b13f9f1c5b4aa903706140472c62bf122797803ab
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that is likely part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'dna worksheet answer key biology'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://queure.ru/pbw?utm_term=dna+worksheet+answer+key+biology
    • https://cdn-cms.f-static.net/uploads/4385435/normal_604331fea026a.pdf
    • https://cdn-cms.f-static.net/uploads/4451950/normal_6012b0dd43815.pdf
    • https://cdn-cms.f-static.net/uploads/4476268/normal_5fd7cb6995828.pdf
    • https://cdn-cms.f-static.net/uploads/4366660/normal_5fd2dd513eaeb.pdf
    • https://dakezevowefop.weebly.com/uploads/1/3/6/0/136088489/4920981.pdf
    • https://netemadore.weebly.com/uploads/1/3/5/3/135306203/36edb6eee9.pdf
    • https://static.s123-cdn-static.com/uploads/4404123/normal_5fc6f04499253.pdf
    • https://zitavuzan.weebly.com/uploads/1/3/1/3/131379524/75e41f22cba.pdf
    • https://pabametutib.weebly.com/uploads/1/3/5/3/135317572/4343064.pdf
    • https://momaduse.weebly.com/uploads/1/3/4/8/134895420/5228904.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zufumegi.pbworks.com/f/domestic_violence_statistics_2020_cdc.pdf
    • http://paderukut.pbworks.com/f/migopev.pdf
    • http://sodopateduke.pbworks.com/w/file/fetch/144424776/what_does_retroarch_emulate.pdf
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144422979/korinukusolexijutajoro.pdf
    • http://wozixokumo.pbworks.com/f/aaa_battery_dimensions.pdf
    • http://fodorafirig.pbworks.com/f/wisudegawuvopeku.pdf
    • http://ziduzobif.pbworks.com/f/galugefido.pdf
    • http://xosufixemuf.pbworks.com/f/potebigozajapegumifu.pdf
    • http://gazumadu.pbworks.com/f/dulugabavobilesamum.pdf
    • http://jetipufagi.pbworks.com/f/tokunbo_2009_lexus_rx_350_price_in_nigeria.pdf
    • http://memofemovo.pbworks.com/f/59410629341.pdf
    • http://mikabipi.pbworks.com/w/file/fetch/144439065/present_perfect_tense_exercises_esl_library.pdf
    • http://negovijalulu.pbworks.com/f/pupovovilugemubusol.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffda.bin
8b035afd02e16fc6ce7d031f7e37f9ec3362c1507c4726a4b18d696ddea429c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 5344 bytes
font_01_sfnt_off00011225.bin
3e87c94f56f488ee07a175b9c534edb222a56f4660968ad8a48e56f8edc3e22f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11225 10748 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.