Malicious PDF — malware analysis report

Static analysis result for SHA-256 6445cfefa1f11561…

MALICIOUS

PDF

101.6 KB Created: 2020-12-21 21:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 025562113cabbdfbc2749ee7310c4117 SHA-1: ed38d1fb288d54e9c849082c0c2e2addeebc7f9f SHA-256: 6445cfefa1f11561ed5d8ef8ac93f9e05f2353d63d2ca19442200afbd5aa696b
214 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The presence of numerous external links, including one pointing to a known malicious redirector, suggests the primary purpose is to lure users to potentially harmful sites. While no scripts were explicitly extracted, the nature of the heuristics points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffmen.ru/strik?utm_term=miro+aew+wiki In PDF document text
    • https://telozigigozato.weebly.com/uploads/1/3/4/3/134310186/ripuzezavute-lufizupaga.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/remeranexe/98273714267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e423d4-f6c8-448b-884a-6cec472c65c8/egyptian_symbols_and_meanings_eye_of_horus.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/wupireja.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/xotope.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/28128812933.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/wewetirasunibarulimeka.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/azygos_vein_formed_by.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/3592344786.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/gmat_official_guide_2018_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/hissing_sound_animal.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/eshop_code_generator_apk.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_off000150fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150FA 4632 bytes
SHA-256: 8fb66369d2e08ab5b16730cbf107af442b5c846e2844df16200207f240d831f8
font_01_sfnt_off000160e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E6 12512 bytes
SHA-256: 49d81e6db0854bac919c11134e664aea2ac2180727493166cee916d5be2def36

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