Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c836925c972f6a6…

MALICIOUS

PDF

85.6 KB Created: 2021-03-14 17:50:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fe8cfa53d17e683cb22c0b7aa2965a2a SHA-1: 99996a4ec50ec7d3dea9945cc9ab5c3b112a6865 SHA-256: 7c836925c972f6a6e161924d9af29095f6f370bb950424937aca97484eece164
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to S3 buckets, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://seumenha.ru/wix?keyword=permutation+combination+worksheet+with+answers', appears to be a lure for educational content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/wix?keyword=permutation+combination+worksheet+with+answers PDF link annotation
    • https://wubabenababi.weebly.com/uploads/1/3/4/4/134432193/564e79e2dd93d3.pdfIn PDF document text
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/siguwufumore_zumoperatij_jazalina_vemasixapiwoni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383156/normal_6015eb963574d.pdfIn PDF document text
    • https://vitigamonewus.weebly.com/uploads/1/3/1/4/131406732/wibisanus_kaxolafinek.pdfIn PDF document text
    • https://nesibebinirudeb.weebly.com/uploads/1/3/5/3/135311353/c991ab2715ca0e.pdfIn PDF document text
    • https://vawemuziz.weebly.com/uploads/1/3/5/3/135351027/305891.pdfIn PDF document text
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/3669016.pdfIn PDF document text
    • https://gubulugovidenu.weebly.com/uploads/1/3/1/4/131406252/govudutijofadusixud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388619/normal_60263f3084cca.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/dotivaf/taxorevizopaladosu.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/97779147275.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/bending_moment_and_shear_stress.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/bewojozabumejivu.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/wireless_2000_annunciator_system_rc-_20u_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/81283980893.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/badudifonukulivudero.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/51385815108.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/2018_fantasy_football_cheat_sheet_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/33305735638.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/3d_chess_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/xarogafudedamapuxolaruni.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/quadratic_equation_word_problems_using_factoring.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/caliban_s_war_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 5304 bytes
SHA-256: 4489e0cd0eb44b26b34995cc1040096a1282f072e0f6f2d150eca315e8c9ec1b
font_01_sfnt_off00010908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10908 12420 bytes
SHA-256: 08f14e83da2fcf5959d28d15ac5616625a4fa18ba82628fc60a29d5f599b0d61
font_02_sfnt_off000133a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A6 16116 bytes
SHA-256: 222be4e60487f2fb9ff27f8169a62d30ead1b1540dda67eeea81c3193073c8af

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