Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7116964ad528e9…

MALICIOUS

PDF

74.2 KB Created: 2021-03-17 22:30:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e09a0cc25b0b384984615f9f4b8e6e9f SHA-1: a4845a745859fc18a3a7455ad85e163b2af3c95b SHA-256: 7f7116964ad528e9ed0251f6669d87c251032aa931bf766e931d06738aefabad
156 Risk Score

Malware Insights

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

The file is a PDF document that has been flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing or trojan variant. It contains a large number of external links, suggesting a link farm or redirection strategy. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs indicate a malicious intent, likely to lure users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/award?keyword=importance+of+work+life+balance+in+the+workplace+pdf
    • https://static.s123-cdn-static.com/uploads/4446378/normal_6003647809382.pdf
    • http://216tilford.com/zegapekafisopuzuseboper7xfi2.pdf
    • https://potigaguw.weebly.com/uploads/1/3/0/9/130969810/65fc5168083.pdf
    • https://nugaginidej.weebly.com/uploads/1/3/4/4/134475369/8049877.pdf
    • https://cdn-cms.f-static.net/uploads/4489732/normal_6033acc80eaae.pdf
    • http://vanimerukaguto.scienceontheweb.net/best_place_to_learn_final_cut_pro.pdf
    • https://cdn-cms.f-static.net/uploads/4453102/normal_60380ae1ebc84.pdf
    • http://kevekozulanilim.sportsontheweb.net/cerebral_palsy_occupational_therapy.pdf
    • https://lerizizevu.weebly.com/uploads/1/3/4/3/134314130/1171970.pdf
    • http://helplnstagramoffice.com/537858241189ix3l.pdf
    • https://xemelavu.weebly.com/uploads/1/3/1/4/131437726/winodezuvesag.pdf
    • https://cdn-cms.f-static.net/uploads/4408862/normal_6040be634011c.pdf
    • https://lakojelot.weebly.com/uploads/1/3/1/6/131637836/fead5.pdf
    • https://cdn-cms.f-static.net/uploads/4474727/normal_602be673ec890.pdf
    • http://nebofimanigi.sportsontheweb.net/asian_stock_market_open_time_est.pdf
    • https://cdn-cms.f-static.net/uploads/4372972/normal_60194d98314cd.pdf
    • https://cdn-cms.f-static.net/uploads/4448110/normal_6033dfc04a288.pdf
    • https://cdn-cms.f-static.net/uploads/4379842/normal_601510f81ea89.pdf
    • https://tixipatu.weebly.com/uploads/1/3/1/3/131382495/5640765.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://naranosufok.atwebpages.com/siwirejawuzidilogivisas.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_off0000e343.bin
f1198f63b737ce2a6ddee0df2f84e9afc101d18702264036201267227511031a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 5452 bytes
font_01_sfnt_off0000f5ad.bin
e3463c7a908c93393957d57e888c9237f1ca0aadeba9285a187a879a8d231d8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 10524 bytes

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