Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc50baec7d113a51…

MALICIOUS

PDF

71.8 KB Created: 2021-03-31 19:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5073f4b3c1252ee2573566ce5c5f6ec0 SHA-1: eeb7bef4e728780eef8dc99d7c1a6d46c1bb18db SHA-256: cc50baec7d113a51a352235b69770f217e0179486a4b114f2034e5159f1b23f7
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or SEO spam campaign. The primary URL, 'https://seumenha.ru/wix?keyword=glencoe+algebra+workbook+answer+key', indicates a lure related to educational materials. No scripts were extracted, but the PDF structure itself facilitates the redirection to these malicious URLs.

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://seumenha.ru/wix?keyword=glencoe+algebra+workbook+answer+key PDF link annotation
    • https://todusoxi.weebly.com/uploads/1/3/3/9/133999566/4794134.pdfIn PDF document text
    • https://rujupiben.weebly.com/uploads/1/3/4/8/134852491/8cc490.pdfIn PDF document text
    • https://cdn.sqhk.co/sapasimemo/8AOTygi/java_audio_mp3_player_project.pdfIn PDF document text
    • https://juwalonivegab.weebly.com/uploads/1/3/5/3/135309433/9de79e677.pdfIn PDF document text
    • https://cdn.sqhk.co/botikavanov/fghI8gj/zazuto.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/bafosekeriseler.pdfIn PDF document text
    • https://cdn.sqhk.co/paxepilekot/ihYUgje/9579327124.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_ba106149f54944fd9789677859be9609.pdf?index=trueIn PDF document text
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_65989945fcb04392a33623f11f9283cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/1993_ford_ranger_manual_transmission_fluid_capacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ab92fd1-7889-454a-bb09-d2075b4dadcc/79100442663.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/latin_phrases_about_life_and_their_meanings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb220549-2b17-4e97-ac0c-44c7460868e3/15199400160.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/amplified_classic_bible_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/24541327722.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/adobe_illustrator_cv_templates_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/193b1274-27e8-4857-b6af-673e3b8cf92c/redmi_note_4_screen_replacement_cost_in_pakistan.pdfIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_759297f48fcf409fb03bbe76a7d25c11.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 5396 bytes
SHA-256: c2bbb0d7d6292c02b46556712ec149a8ab93769240045bd683a7fee164bdd161
font_01_sfnt_off0000edee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEE 10160 bytes
SHA-256: 301b8b6eae7cea9ba7eb10d1107f07303b8fe88b43274368e84185d66ad74f8e

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