Malicious PDF — malware analysis report

Static analysis result for SHA-256 e851871feeb94247…

MALICIOUS

PDF

72.5 KB Created: 2021-01-21 18:17:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6f246a9ffe9dbf9124433770ea5e360c SHA-1: d0720e5c8b029ce4cc66e7b5a61297151250e2e2 SHA-256: e851871feeb942477d0fd17adab8283ff31bc98bd16c9f3e6af39b3cba2264eb
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors and link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO-based traffic redirection. No scripts were extracted, but the presence of numerous external links suggests the document's primary purpose is to redirect users to potentially harmful websites.

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://ggtraff.ru/123?utm_term=marriott+peephole+video+reddit In PDF document text
    • https://cdn.sqhk.co/segenapiza/5oE9wFu/zuwelopazukitinara.pdfIn PDF document text
    • https://kofovozeregom.weebly.com/uploads/1/3/4/3/134313602/7956840.pdfIn PDF document text
    • https://cdn.sqhk.co/jetobatu/qVjajcz/sowefokevuz.pdfIn PDF document text
    • https://dodemitewiv.weebly.com/uploads/1/3/1/3/131380707/329760.pdfIn PDF document text
    • https://cdn.sqhk.co/wujodazera/HjcvFgd/vebaxetolinemunot.pdfIn PDF document text
    • https://cdn.sqhk.co/peretudiwi/hi9hgij/wopomopikavavisom.pdfIn PDF document text
    • https://xijiruxexewige.weebly.com/uploads/1/3/4/7/134725886/vofubad.pdfIn PDF document text
    • https://joverukaded.weebly.com/uploads/1/3/4/4/134433057/5919533.pdfIn PDF document text
    • https://site-1171522.mozfiles.com/files/1171522/mejogerosodozab.pdfIn PDF document text
    • https://sodikisug.weebly.com/uploads/1/3/1/4/131437766/jumubokikuxuboxi.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/tevigotu/lyon_france_tourist_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/yesterday_beatles_cello_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/bsc_computer_science_syllabus_pune_university-.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/battle_trip_wanna_one_sub_indo.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/xibuzigokuzefa.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/futiwivajufuleroxoguv.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_off0000dcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCE 4932 bytes
SHA-256: 5e08fef86dfc30c6cae1ba7bd85c7ac1413bdd6617caf452fd26407572eeb95a
font_01_sfnt_off0000eda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 11636 bytes
SHA-256: c78e27a3bbc582d13b55c77f20d92aad77bcdc5a04beca91b100ddde462131e8

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