Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da8ecc8102e0936…

MALICIOUS

PDF

96.1 KB Created: 2021-03-11 22:44:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: c146a387ed4c57ff3218507331f95be8 SHA-1: bb76518126fba184b1411cbb3cea9e2e4a536cde SHA-256: 6da8ecc8102e09369e1b0fd90293a8da33886da69100fa6483b4a79f4bd14216
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable hosting and redirectors, indicating a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=associated+legendre+polynomials+table PDF link annotation
    • https://cdn.sqhk.co/zosiwikiw/e4VdfVZ/download_game_dumb_ways_to_die_1.pdfIn PDF document text
    • https://cdn.sqhk.co/xalisufa/hhdhbA4/influencer_challenge_clean_house.pdfIn PDF document text
    • http://kifenefazujiz.iblogger.org/line_drawing_techniques_worksheet.pdfIn PDF document text
    • http://shoop-ff.ru/demotefmjjgz.pdfIn PDF document text
    • https://cdn.sqhk.co/dopiporajen/hjbgcMX/luvaxevoreruga.pdfIn PDF document text
    • https://cdn.sqhk.co/podogule/aJPgeyA/jatusozaritelefuwu.pdfIn PDF document text
    • http://instup.xyz/gedixaposiminifotajqnjas.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/soehdgi/50329061181.pdfIn PDF document text
    • https://cdn.sqhk.co/dosapupa/stkghha/runogenuruxufemefosekem.pdfIn PDF document text
    • http://wordwild-store.com/tabumavolenerq8y8j.pdfIn PDF document text
    • http://belkwigs.com/4914481159149anj.pdfIn PDF document text
    • http://vidclips.design/88626911556xofl0.pdfIn PDF document text
    • https://cdn.sqhk.co/menodotitit/gghfDif/45109621625.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://uploads.strikinglycdn.com/files/1f93af10-4613-4326-9d68-8f3d27e34c98/what_are_inferential_statistics_in_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6a9f92c-07ec-4fea-ad20-f7b59446981a/mrs_dalloway_sparknotes_chapter_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1edf397-e7bb-4010-8b84-9034fc453854/tecsun_pl-660_vs_pl-680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/414caf04-4d5c-4512-bdec-d2c43812184e/94704667884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dc120a7-fc0a-4572-a82f-8bd4baa9fca3/metro_2033_book_series_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f542881d-e17e-4de5-b90c-1886d12f8a27/does_tesla_white_interior_stain.pdfIn PDF document text
    • http://tabarok.rf.gd/quadratic_equation_word_problems_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/649bb628-fd32-4dab-8345-81219392b380/hp_deskjet_6940_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef83bdb4-52e9-419c-b99d-b1247dab2c78/kohler_generator_parts_warranty.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_off00011020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11020 5412 bytes
SHA-256: 875f23607181a671a41c65c443d98db9417aad0169efc0fd3aed3d01c339e786
font_01_sfnt_off00012266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12266 13160 bytes
SHA-256: 8435b2112dbd44e54082c07f8f10915088ae9515210632fb81eaca18593a8da4
font_02_sfnt_off00014f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F52 16196 bytes
SHA-256: faf33ac5f8cadb146569092804048d923f33a655ad7689bd0af6eb960936e3f4
font_03_sfnt_off00016494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16494 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378