Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e255a6786ec0af5…

MALICIOUS

PDF

96.0 KB Created: 2021-01-24 21:01:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3e1cc22f976f1fa50d1f77345df83be0 SHA-1: afe2fe04c6f845d2d535d43792f5336a8c165044 SHA-256: 9e255a6786ec0af5ab0c4907802a309df169f160844f9c8bb419dc7ba4b6a999
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and Weebly-hosted files, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's 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
  • 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.
  • 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://maypoin.ru/123?utm_term=l+to+j+math PDF link annotation
    • https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/4544476.pdfIn PDF document text
    • http://storedubai.shop/75810137059k0n.pdfIn PDF document text
    • https://ziloxewimufe.weebly.com/uploads/1/3/0/8/130813797/cf98debdb59b91.pdfIn PDF document text
    • https://nazumuliwoj.weebly.com/uploads/1/3/1/3/131383416/5775857.pdfIn PDF document text
    • http://1gusevshop.space/all_ticket_to_ride_games_rankeda1fut.pdfIn PDF document text
    • https://midejunefe.weebly.com/uploads/1/3/5/4/135400465/fegoga.pdfIn PDF document text
    • https://toxoladosa.weebly.com/uploads/1/3/4/4/134479392/tavalenopoj.pdfIn PDF document text
    • http://soguged.22web.org/ssc_answer_key_2019.pdfIn PDF document text
    • https://muzuxagofonokow.weebly.com/uploads/1/3/1/4/131406885/5960282.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xitemefunugege.epizy.com/lirinulimuxe.pdfIn PDF document text
    • http://vuwejamadadodi.epizy.com/injustice_gods_among_us_mod_money_apk.pdfIn PDF document text
    • http://wemosoxa.rf.gd/lemoxuvinol.pdfIn PDF document text
    • http://sudiwoke.epizy.com/javedasir.pdfIn PDF document text
    • http://buwepuxaj.epizy.com/15725392037.pdfIn PDF document text
    • http://favekagopu.epizy.com/35492459100.pdfIn PDF document text
    • http://jewojaregoluwat.epizy.com/vidifopuvomokimoduxu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001215b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215B 4152 bytes
SHA-256: 2a948443817cfe0f41240eaac5e400785d2e720780c3be6837462e11afb1cee3
font_01_sfnt_off00012f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F69 19012 bytes
SHA-256: 9d9eeb039b6f013d18625c8b5922f998b64e68f5302b6d5979c1dd1525808d95
font_02_sfnt_off0001654d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1654D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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