Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dfbb02d90336d21…

MALICIOUS

PDF

87.4 KB Created: 2021-03-22 12:08:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2bfb02c25dcba0af279c45b0667116f3 SHA-1: 88a5847a6d8f4483be515aafe02579a09a98d94d SHA-256: 6dfbb02d90336d21f79999e2016e4c65ccaf105c13b8cbb1dd087e9e1e37666e
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=chapter+7+anatomy+and+physiology+workbook+answers PDF link annotation
    • http://blankid.ru/ccc_ka_full_form_kya_hota_hai1mflf.pdfIn PDF document text
    • https://lufumapapolag.weebly.com/uploads/1/3/4/3/134353855/3005710.pdfIn PDF document text
    • http://options.expert/pentatonic_scale_guitar_lessonka1kl.pdfIn PDF document text
    • https://weraxugunelega.weebly.com/uploads/1/3/4/7/134719696/sidebififimeje.pdfIn PDF document text
    • https://zedazepofa.weebly.com/uploads/1/3/0/9/130969939/zuvasubotufona-ridofap-simosivopabul-nokavesutama.pdfIn PDF document text
    • https://pavufunipuz.weebly.com/uploads/1/3/4/2/134265556/zifawuma.pdfIn PDF document text
    • http://mydenverneighborhoods.com/48902815392t7nu3.pdfIn PDF document text
    • http://steblin.pro/71016060025a043r.pdfIn PDF document text
    • http://1fps.ru/kedisisexobomalujuguneb4km2y.pdfIn PDF document text
    • https://gazobibulome.weebly.com/uploads/1/3/4/7/134775133/xapizirazodogag_futifogukulu_sotivogesa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/77917849-f41e-4fa3-ba22-72f0b3f7dda7/what_is_gothic_art_characteristics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dce10277-5906-4dea-b5f0-4ced9802c3de/mabowumukiwasusemededivow.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/four_seasons_vivaldi_winter_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/dewutudem.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/xadofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ebd35b3-b1f6-43b2-b75f-dfa50dc3b659/general_merchandise_retailers.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/safety_first_sign.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/kawaii_how_to_draw_really_cute_stuff_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/24401422703.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_off0000fe6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6C 6268 bytes
SHA-256: 5167d5c6a294a4130884dd0adfbafcb57f53587c5af047f4332c57a4a8396999
font_01_sfnt_off000113ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EA 5756 bytes
SHA-256: efb03a6ae879aa672723d0008f5965737f4e5a3c8a834cf6a20619a18db3182b
font_02_sfnt_off00012770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12770 11228 bytes
SHA-256: 953ebc15c1c00ce9c553b799fb3b20039366c0e9c0722bb3436068e92257b056

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