Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25908da223f31e4…

MALICIOUS

PDF

78.4 KB Created: 2021-03-07 22:59:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e4b979ada9696ce1a43238d539746b96 SHA-1: a3543c8053a3e6a874162a2c083d6c23d20040b0 SHA-256: f25908da223f31e4c3b626a770d28c9faa68904a57e8ecbc0fe90a47135c40fb
166 Risk Score

Malware Insights

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

The PDF contains high-confidence heuristics indicating it is a link farm and uses suspicious invisible links to external domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attack pattern designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://fokemale.ru/strik?utm_term=does+a+fly+have+antennae PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498404/normal_601845883eee4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443326/normal_604329c75a15c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393193/normal_603cbcb6a8b4f.pdfIn PDF document text
    • http://smotrikino.fun/kinetic_molecular_theory_of_gases_worksheet2gujs.pdfIn PDF document text
    • http://copyright-security-ig.com/the_non-designers_design_book_4th_editionnpsb1.pdfIn PDF document text
    • http://lavkavkusa.store/68133278878y8q4q.pdfIn PDF document text
    • http://stebsmeh.space/14676930823d72xc.pdfIn PDF document text
    • http://lnstagramcentre.net/74558793183m9fm1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393488/normal_603839e289a09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490950/normal_600f7791c6aa6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388285/normal_5ff3e9f4406fa.pdfIn PDF document text
    • http://cafe-cok.ru/torirabojoximl7ds.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/xerox_wc_7835_tonerjajba.pdfIn PDF document text
    • http://groby-ritual.online/juginikajajivujefutagqdfe1.pdfIn PDF document text
    • http://gatorama.fun/how_to_reset_a_swann_security_systema0drw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rexivire.epizy.com/livarunonewi.pdfIn PDF document text
    • http://fegafefokijun.epizy.com/cuanto_es_1_1_8_inches_en_centimetros.pdfIn PDF document text
    • http://numebazo.rf.gd/rejixunarurezeduwupuma.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_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 4920 bytes
SHA-256: 58f7f191c1a710909231364c19adc5964bd77eea34b512b96a8a1ed70408e273
font_01_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 10984 bytes
SHA-256: 84d70f93df78ca510982e9cfc3b1b9ee0d137e7513dba78a7735295d6cfb2ab2

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