Malicious PDF — malware analysis report

Static analysis result for SHA-256 622ef5c67bfbaa77…

MALICIOUS

PDF

75.2 KB Created: 2020-11-24 07:24:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4b09a66fbd79bc615d4c4e4098ceaa84 SHA-1: d3a5cd589238900e014b8290c597a8151a94b363 SHA-256: 622ef5c67bfbaa779f505247379041696b7ba5453c404bf53473bd05ae94ff84
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain text related to 'ukulele chords', likely a lure. The presence of many PDF links, including one pointing to a malicious redirector, suggests an attempt to drive traffic to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=ukulele+chords+songs+ikaw+at+ako In PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/50a77143625eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385427/normal_5fb3d72e9f9c9.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/banula/ygopro_apk_for_kindle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63b53525-0a89-442a-8059-411b6950e157/dukejilise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef7a202d-8dcd-41ed-a717-ee9b3e143a22/fojiluwigoguwusidikarev.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/xamanabedekate.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/double_displacement_reaction_description.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09cd2a9e-e246-41a3-b1b2-b4bd63a826fe/chimera_jailbreak_download_ipa_1.2.5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db9a469c-69f2-47f0-8847-34fce2b2917b/12882824524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/473e7244-efaf-4757-8511-5676e8be4f2c/37536265408.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/vipoworido.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/93146980805.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_off0000c5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BB 5348 bytes
SHA-256: f3f32a932399518a2f76f1b5bfd35915269044b504c499d72d138806cf3046a0
font_01_sfnt_off0000d7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F1 2344 bytes
SHA-256: 50b5f0cddff3b338576dac2a57891674473d34369aa484b88b97bba50e9fd192
font_02_sfnt_off0000e29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29E 11796 bytes
SHA-256: bd52dd9806fa08b6570b403af856b0d359f185ca5f5109e70566fb7f38a74045
font_03_sfnt_off000109d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D4 16168 bytes
SHA-256: 208743bdf3cc7a8a57817f7ac27e1b4abf7f4d36f593c9986615c5a5543e6963

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