Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0ee8ee57c8158e…

MALICIOUS

PDF

81.9 KB Created: 2021-04-04 03:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 575c9837595f4b1ddfc5dc4545137e28 SHA-1: 2132664a42bb64047feddad76f8a4b60591dfa9c SHA-256: 4b0ee8ee57c8158e914cbc04109f0a98b6d845ccdd6d5e9d415331fd1e23ec73
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary suspicious URL pointing to a domain associated with a link farm and UTM parameters suggesting a lure. The document body, though heavily obfuscated, appears to be a pretext for directing users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=explain+how+animals+protect+themselves+from+their+enemies
    • http://bigezidara.mypressonline.com/euripides_iphigenia_in_aulis.pdf
    • http://sawedes.mywebcommunity.org/31062356211.pdf
    • https://static.s123-cdn-static.com/uploads/4426418/normal_5fc86635eb973.pdf
    • https://cdn.sqhk.co/jogowijalaro/zyjj77D/lasers_retirement_forms.pdf
    • http://palubofapejuraw.mywebcommunity.org/asosiatif_dan_disosiatif.pdf
    • https://static.s123-cdn-static.com/uploads/4485570/normal_5fcf153f64fa9.pdf
    • https://cdn.sqhk.co/mazinenik/gQzGIhb/viral_infection_symptoms_in_mouth.pdf
    • https://cdn-cms.f-static.net/uploads/4453335/normal_5fd6b2ba5b157.pdf
    • http://wazepewazivulil.mywebcommunity.org/xekalax.pdf
    • https://cdn-cms.f-static.net/uploads/4480414/normal_5fd6a02290306.pdf
    • https://cdn-cms.f-static.net/uploads/4469645/normal_6059dace51025.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gojetovumivet.epizy.com/84777623660.pdf
    • http://sajogaluka.rf.gd/guia_autometrica_febrero_2020.pdf
    • http://fumexilali.rf.gd/kudunojugubo.pdf
    • http://vujuvisesakok.myartsonline.com/washington_redskins_schedule_2021.pdf
    • http://fodobapeda.rf.gd/27466168612.pdf
    • http://kixomeremit.epizy.com/doyles_guide_personal_injury.pdf
    • http://zumaruzafomadik.rf.gd/lapizopawe.pdf
    • http://madepubas.epizy.com/brukner_and_khan_clinical_sports_medicine.pdf
    • http://kedogevakubonog.epizy.com/como_aprende_el_cerebro.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_off00010294.bin
7ea00610d3e37557db8abf8c9ab52086ec3046bca819b7fa9173ca3bf16f21b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10294 5432 bytes
font_01_sfnt_off00011505.bin
c02b87c2ae336b1dc09544b95cc09560fd06a4dd6e0a0b6fd0315a4244abcedc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11505 10856 bytes

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