Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e168114bd8183c1…

MALICIOUS

PDF

82.5 KB Created: 2021-02-28 04:23:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 773d5ef759dd8965dbc1a9c0b348a482 SHA-1: 8c48ee3cdf8c68b7e0dbf2921384b6078b8f7a5c SHA-256: 8e168114bd8183c185936e221c94fe0a9953d7fb89520b5069062534849de050
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous external URIs pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/wix?keyword=necesidades+fisiologicas+del+ser+humano+segun+maslow PDF link annotation
    • http://fekevopimibun.sportsontheweb.net/rojudu.pdfIn PDF document text
    • http://dekiweragaf.mywebcommunity.org/mulagigapivuwuvino.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/garigikaj_pinatilup_dezegupozup_vuvakegakidez.pdfIn PDF document text
    • http://x-bionic.shop/juwazidurbeo06.pdfIn PDF document text
    • https://xawizavikerid.weebly.com/uploads/1/3/4/5/134525990/fetesegi.pdfIn PDF document text
    • http://goldstein.berlin/what_does_brown_period_blood_mean_pregnancy13wt1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470224/normal_5fd7091b37270.pdfIn PDF document text
    • https://durajonuz.weebly.com/uploads/1/3/1/3/131383269/6a223b0de3388.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/kidde_p3010cu_reviews.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/19594688575.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/spreadsheet_for_household_finances_ukpyz1t.pdfIn PDF document text
    • https://dotaterezisal.weebly.com/uploads/1/3/4/7/134771172/16b96253f0df.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/cMkheCn/fidixiwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10429 5496 bytes
SHA-256: 744dceb7abf5c87f7de3011c499911c3add5878922ad5c078b2012e306e148b7
font_01_sfnt_off000116cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CD 11188 bytes
SHA-256: 43a8b3814c151f90a0e776104dff1e1baa1441c41ec41bfa8b7af56db220aea3

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