Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef776fa43054402…

MALICIOUS

PDF

85.1 KB Created: 2020-12-20 13:45:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6dd1b58b062058a51063dcb74fadda12 SHA-1: 801f80a6c5bbcf39682b048619ea16afb1eb6d6f SHA-256: 5ef776fa43054402c4b05384dfb82263182fe2831b3f07a8f8b59fc87f486e53
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with critical heuristics indicating it links to known malicious redirector infrastructure and a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of malicious links is sufficient evidence of an attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=boat+trailer+dolly+electric In PDF document text
    • https://lovarewido.weebly.com/uploads/1/3/4/3/134322716/mavet_tujevavas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462096/normal_5faddef4f3fc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409797/normal_5fcb8eab57301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470405/normal_5faa2c3dd90a2.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/jiwotarotavuz/nulixofilogimabilokesu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc78e0da4492a057e242502/t/5fcfff6a68a40d5ef20ed456/1607466858082/hitman_2_gold_edition_crack_chomikuj.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc505c01c8c7413144c6c55/t/5fcba3817ab0f364abb06fa5/1607181187556/flipkart_online_shopping_app_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/bangkok_post_newspaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5263b66-e682-4d91-ac35-9e2738110d22/harry_potter_and_the_sorcerers_stone_movie_google_drive_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/tiruxijakotumuvupoku.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/19168947916.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/indian_song_hd_1080p.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd3a8a51e6b539731b098d/t/5fdde61c91828d0f5d37758c/1608377884921/apush_course_description_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10dd611f6a419848684c6/t/5fc39c2a4e98326c0280420a/1606655028585/bewejasobimajepi.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_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 4588 bytes
SHA-256: 652a27374be37075d002264716950148d925bd951e4082880a6dcd7753228053
font_01_sfnt_off00011142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11142 11544 bytes
SHA-256: 6e497079f3e05ab8e391e09ae3cf79de8fe90286a436f40e561142717f9109f9
font_02_sfnt_off00013786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13786 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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