Malicious PDF — malware analysis report

Static analysis result for SHA-256 b344090eb8a1147e…

MALICIOUS

PDF

78.2 KB Created: 2020-12-18 22:41:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f9000c5c489ca8b838718e220c82e0ea SHA-1: bca264731cc9c4a327cd642dcc13194a73fb0ddc SHA-256: b344090eb8a1147e5a962a3de278a48cb489d8aa6399d06f197c05e5968cea9b
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 0.9996

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
  • 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://trafffi.ru/strik?utm_term=christmas+songs+for+guitar+duet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384821/normal_5fa497661eb26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387052/normal_5fc6453421942.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/51f0bbcd1782bf9.pdfIn PDF document text
    • https://wevupifusa.weebly.com/uploads/1/3/4/3/134356286/849142.pdfIn PDF document text
    • https://xunitumewotoril.weebly.com/uploads/1/3/4/6/134612341/lebigokoped-wuvabifi-rozimosexuxo.pdfIn PDF document text
    • https://fenulibamale.weebly.com/uploads/1/3/4/6/134601409/dizalamarak.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://static1.squarespace.com/static/5fbfff689955c744b536924c/t/5fca4053e4017829c1762faa/1607090260223/dixakinutemul.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/5671832580.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdcabee0a190b16b315d1db/t/5fdce5144e32734bb8ca4ff6/1608312089222/25687809562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87075bbc-4c24-4cc9-82c9-9b39af2674d0/kibuzegomut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d45acd0-9431-4ccc-8552-7f9b91532b57/cuento_el_nio_y_los_clavos.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc650b8a13a450bab19576a/t/5fd1617d23f2866aa37b4d5f/1607557501848/do_you_play_tennis_in_french.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/822e1718-6f28-4051-b39d-ddbbeb47e86a/9774854454.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbffe9d5687f52b6b7c161f/t/5fc1b46118e72e5fdb17b57c/1606530148314/the_laramie_project_transcript.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2e9962bbd74065813b99d/t/5fc621755147b1480403f3a8/1606820214737/7133336535.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/manual_pedaleira_boss_me_25.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C7 5192 bytes
SHA-256: cb26a815a674e7a64f54594aefd1d993d3d419298556ed0579a00db087ce727e
font_01_sfnt_off0000e445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 10464 bytes
SHA-256: 5a4c294592c38b5a0cfb997e7f6a091f8433ce20ff75e3f30e6b18736b5ce447
font_02_sfnt_off000107d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15
font_03_sfnt_off00011d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D60 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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