Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3783c3741aa708f…

MALICIOUS

PDF

84.3 KB Created: 2021-04-05 23:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b69091ce096b29bb1c6f2c17e311f7e2 SHA-1: 0831d05b76a698c67ec1a090307958d5f50b9165 SHA-256: f3783c3741aa708fe234a5bb627e805dd63efe4f35c0cc397ff92ee4a837ed36
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://bologen.ru/wix?keyword=henry+foster+middle+school+longview+tx PDF link annotation
    • https://sumomaduge.weebly.com/uploads/1/3/4/8/134884200/nukoweki.pdfIn PDF document text
    • https://baseparefawufif.weebly.com/uploads/1/3/1/4/131453046/butatumojo.pdfIn PDF document text
    • https://cdn.sqhk.co/wemowubire/evycQZj/46542809955.pdfIn PDF document text
    • https://sojenumodab.weebly.com/uploads/1/3/5/2/135296615/5939794.pdfIn PDF document text
    • https://cdn.sqhk.co/pijovowifil/siPQ8id/personal_assistant_jobs_las_vegas.pdfIn PDF document text
    • https://cdn.sqhk.co/tefivezik/hgPPNjf/59401439693.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/YhbieUP/5476732540.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/sisaxu/fiwaketamesapetiniki.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/jidokakovavomaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b052190d-4da6-479f-9713-988b5e33931e/how_long_does_a_maytag_bravos_washer_last.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/sunibokokag.pdfIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_14efd154ee804a2da9af8b658f7a841f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satulibaren/how_to_read_first_aid_step_1.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/gizolejazo.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/best_gujarati_bhajan_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/what_is_a_sentence_for_monasticism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df5b34ca-8882-4ecf-9810-e11b8c31ac46/33634190188.pdfIn PDF document text
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_1d6ef6036b924c1fa0b30dbfd89eec6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/01228895-b223-45e1-9fed-3fd9e84be279/desiragi.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_off0000fdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB3 5296 bytes
SHA-256: 9eee0c26aa78f58100e7b5e4311bc8da49e6c965618c674dbbf8e285548b1572
font_01_sfnt_off00010fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA5 10660 bytes
SHA-256: 6adf1806717c23bc619112e353de0295c1413c2b2f2e7afd4c2970246ad928b9
font_02_sfnt_off00013449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13449 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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