Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25d7bed4a2eec30…

MALICIOUS

PDF

73.6 KB Created: 2021-03-29 12:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97b1d98abfdbfc14cd78a673f6587c7c SHA-1: 7f377915c84517c54aee4fea2456506b6c3baee2 SHA-256: c25d7bed4a2eec30f800208390e6965cf105fbfeab2c1e6eac55b79d3c6f4e21
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating a link farm of external PDF documents. The primary external URI points to a website that appears to be part of an SEO-based lure, suggesting an attempt to drive traffic for malicious purposes. While no scripts were directly extracted, the PDF structure and external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/wix?keyword=my+life+is+in+you+lord+lyrics+kirk+franklin
    • https://cdn-cms.f-static.net/uploads/4420911/normal_601c97011ef70.pdf
    • https://static.s123-cdn-static.com/uploads/4443356/normal_6001c398d4220.pdf
    • https://cdn.sqhk.co/vujositet/ghjtiaK/battle_royale_3d_warrior63_old_version_download.pdf
    • https://cdn.sqhk.co/dapalufited/aHhgRhj/bepazopuvodazupezuzufuv.pdf
    • https://static.s123-cdn-static.com/uploads/4501212/normal_5ff511a53e11e.pdf
    • https://cdn-cms.f-static.net/uploads/4413235/normal_6023d36c67bbc.pdf
    • https://cdn.sqhk.co/kixikeli/HlLE6id/guwusokifiwa.pdf
    • https://cdn.sqhk.co/xipitufekaru/gAjeqK2/vubedesuzafigubiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_e7dc3ae9a2db49fdb723bc01474a5489.pdf?index=true
    • https://s3.amazonaws.com/jevopemosod/kexijirikinisapas.pdf
    • https://s3.amazonaws.com/vaxebisapesi/lakaw.pdf
    • https://1ae094b9-110d-4377-a83c-911b29edd90d.filesusr.com/ugd/d5eada_ca93af346c724b44842204ae23d0b9b0.pdf?index=true
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_b9f47736185e4335b5f474958e14883b.pdf?index=true
    • https://s3.amazonaws.com/rimejiguvif/antiemeticos_para_nios.pdf
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_94c3b99670694a7d8325d917c8aa503e.pdf?index=true
    • https://s3.amazonaws.com/tabobujimo/basketball_offense_plays_for_youth.pdf
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_68d2d6eabfde4193b29b1b2e6c4cf805.pdf?index=true
    • https://s3.amazonaws.com/fukepez/a_number_decreased_by_8_is_equal_to_6_find_the_number.pdf
    • https://s3.amazonaws.com/simujix/41899390637.pdf
    • https://s3.amazonaws.com/sefepugolupalax/lumafusion_2._0_guide.pdf
    • https://s3.amazonaws.com/jixerubowi/4328302200.pdf
    • http://divupalol.epizy.com/fupox.pdf
    • http://ruguweronum.rf.gd/its_your_ship_audiobook_free.pdf
    • https://s3.amazonaws.com/legesiliv/2d_and_3d_shapes_worksheets_ks1.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df47.bin
108d066d6f6c158be12bc79f338e3b2baf5c7cc158aff2bd112d82e240138d87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 5184 bytes
font_01_sfnt_off0000f116.bin
df245376b0ad444f848bbca3261e1f50430de11eec1bee58f43b81e6a2e1a257		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 10996 bytes

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