Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd25e5ff371fe88…

MALICIOUS

PDF

78.1 KB Created: 2021-02-19 13:20:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: cbe1569fb3221881474105823ca6af2a SHA-1: c5108ee9a1912a7f79f2e76d72bdd79cb1098fc4 SHA-256: afd25e5ff371fe882488e2b4095a301a1d8065d82305522fba4196f2cf747288
244 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence indicate a malicious intent, likely to redirect users to harmful sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/123?utm_term=chicken+soup+for+the+soul+inspiration+for+writers In PDF document text
    • https://gixunilaw.weebly.com/uploads/1/3/1/8/131856646/woxot.pdfIn PDF document text
    • https://rulorakaduf.weebly.com/uploads/1/3/4/4/134480735/bebigap.pdfIn PDF document text
    • https://fekukutetixamam.weebly.com/uploads/1/3/4/6/134636283/wafitedawasatim-wogawovepudu-bijuvibutudedal-kowej.pdfIn PDF document text
    • https://rusokupos.weebly.com/uploads/1/3/4/4/134468665/bagewemefilig-turapawaki-vipajixogolevun.pdfIn PDF document text
    • http://bostpolamos.site/panasonic_talking_caller_id_phone_answering_machinewj809.pdfIn PDF document text
    • http://kawlites.online/bombay_tamil_movie_video_songs_hdavycb.pdfIn PDF document text
    • http://setlyb.online/susisafinazototidewhh5xc.pdfIn PDF document text
    • http://wukosemat.22web.org/telecharger_cours_atomistique.pdfIn PDF document text
    • https://nozonefabizeg.weebly.com/uploads/1/3/0/9/130969368/4474037.pdfIn PDF document text
    • https://tilakajunobeka.weebly.com/uploads/1/3/0/7/130739719/fiwob.pdfIn PDF document text
    • https://guxisawupejova.weebly.com/uploads/1/3/0/8/130814058/f648dfffa19.pdfIn PDF document text
    • https://jonurimexiv.weebly.com/uploads/1/3/4/3/134321783/540fc2.pdfIn PDF document text
    • https://dolunejasuvufa.weebly.com/uploads/1/3/0/7/130776008/77aeec0e.pdfIn PDF document text
    • http://allwoman.site/8355813765786s3i.pdfIn PDF document text
    • https://fivipogokofabid.weebly.com/uploads/1/3/0/7/130776003/metifufipev-ravigi.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_off0000f3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 5164 bytes
SHA-256: c5a14d428e8224fd4423130ea528ca9b1ec413827c44afcd8ea602c23c3e96fa
font_01_sfnt_off00010550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10550 10488 bytes
SHA-256: 5483c986a5f1006087804c60aee704d18a74a666dd6d2c2c6cdf62a878d83877

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