Malicious PDF — malware analysis report

Static analysis result for SHA-256 282917f6ff4a37ac…

MALICIOUS

PDF

74.9 KB Created: 2021-02-21 10:18:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 38c782ff552d62bd034dd68bf0bd32f1 SHA-1: f77ed5c4f52457dbefc047c1856f67a8f73cd1e2 SHA-256: 282917f6ff4a37ac3fa93e7d9e8586bc4d60b2f0da530f703f3e3e3fd2197984
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://yafferge.ru/strik?utm_term=how+do+you+reset+a+cal+spa'. Another heuristic identifies a PDF link farm, suggesting an attempt to distribute malicious content or SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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/strik?utm_term=how+do+you+reset+a+cal+spa In PDF document text
    • http://dreabling.online/comic_template_photoshopewbo8.pdfIn PDF document text
    • https://nanavefog.weebly.com/uploads/1/3/0/7/130775134/e6619f99.pdfIn PDF document text
    • https://cdn.sqhk.co/jasowipe/igpgiji/sitolurolibunogolenin.pdfIn PDF document text
    • https://cdn.sqhk.co/lizasizova/hahbjg3/45370015777.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/i3gi2oG/korexewuku.pdfIn PDF document text
    • http://premial.su/pajikozuvipukef0aosf.pdfIn PDF document text
    • https://vomediwanuxorat.weebly.com/uploads/1/3/4/3/134327005/fanirenafi.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/jiIagdB/mermaid_baby_pics.pdfIn PDF document text
    • https://zisovubuzuteb.weebly.com/uploads/1/3/6/0/136086112/povulutumezitojusaj.pdfIn PDF document text
    • http://instapriz.website/reaction_of_aldehydes_and_ketones_with_iodoform_test5si3d.pdfIn PDF document text
    • https://cdn.sqhk.co/xazururoxe/b2hivdL/country_music_news_international_magazine_and_radio_show.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/culminating_activity_keeping_a_running_balance_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/horror_thriller_movies_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/el_politico_azorin.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/jilibawowezesemo.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/1766814010.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/taxelexekewivur.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/bedurebuvob.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/62674921195.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_off0000e669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE669 5220 bytes
SHA-256: e7589a1b2578783c48dddb5c51ba3a5c9cbf6a2252bcc9af4986f69bdbbad9f1
font_01_sfnt_off0000f84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84E 11224 bytes
SHA-256: 28543aadc3da9d61261f53be0a43f158539e74c2d6a61aeac5a1e24d6e0e7ca3

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