Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5a1333f0244347…

MALICIOUS

PDF

68.5 KB Created: 2020-11-20 00:59:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 954f6c6748fc63a1d9679fbece4af5be SHA-1: 286d2cfe2f4163e24d9940a7540f5dac59e24811 SHA-256: ad5a1333f0244347feb5e765330ffd11ec51a969b055535aa9d41da13ecf95d5
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/strik?utm_term=ap+statistics+midterm+exam+review+an In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_5f9cb4f249479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416326/normal_5fa38025ed447.pdfIn PDF document text
    • https://joxetoxuluf.weebly.com/uploads/1/3/4/3/134391367/6434014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487902/normal_5fb30456b81e1.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
    • https://s3.amazonaws.com/gurafoga/word_cookies_coffee_level_19_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/73680522260.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/2548355514.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/62692535614.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/22035505402.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/45598804139.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/27937986814.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/algebra_1_regents_answers_june_2019.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_off0000c25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25B 5072 bytes
SHA-256: 4155efa67c601e61d9d52f4bc50f33bd619df9c5c81c975e5d59d5de387663c8
font_01_sfnt_off0000d386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD386 10720 bytes
SHA-256: d62b23ea432efc0dd8549cc63aa5cb1c26e6524707b862a1c5da9eed30353898
font_02_sfnt_off0000f736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF736 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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