Malicious PDF — malware analysis report

Static analysis result for SHA-256 899babd5003ea988…

MALICIOUS

PDF

83.1 KB Created: 2021-04-03 22:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3358322a2c8e4bd16449c3b9d049f441 SHA-1: e1f34cd2de3dd3eee1eac6f1086c28802297687e SHA-256: 899babd5003ea98867725249e7d34ccf80e8aadc006c48b3e19fca82f85ca6f2
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers. It contains a large number of external links, with the heuristic 'PDF_SEO_LINK_FARM' indicating a potential link farm. One of the primary URLs, 'https://fokemale.ru/wix?keyword=the+purge+films+in+order', suggests a lure related to movie search results, which is a common tactic for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/wix?keyword=the+purge+films+in+order
    • http://train-home.ru/78245555166dl1jr.pdf
    • https://cdn.sqhk.co/bidekidarub/9YTfgjx/67817316749.pdf
    • https://cdn.sqhk.co/letaziseb/azhdhaI/chinese_fishing_nets_quotes.pdf
    • http://gtomishebs.xyz/nonequivalent_control_group_pretest-posttest_design_examplecu2kg.pdf
    • https://dunexekexafu.weebly.com/uploads/1/3/4/6/134622254/b9670d.pdf
    • http://callipakk2.site/die_bremer_stadtmusikanten_textbtjbo.pdf
    • https://cdn.sqhk.co/nuxowilag/hiXz2ha/94583962831.pdf
    • http://lnstagramlivesupportcenter.com/does_red_wine_make_your_stomach_fat27yr1.pdf
    • https://tolejavufagus.weebly.com/uploads/1/3/1/4/131437822/jodusir.pdf
    • https://bisubobotikimix.weebly.com/uploads/1/3/1/4/131438323/7a4ad36ab4.pdf
    • https://cdn.sqhk.co/dutaxato/NgecDmv/zifujuzuditujazikoji.pdf
    • http://malespw.xyz/mapa_turistico_aguilar_de_campooapi5r.pdf
    • https://riwurarelix.weebly.com/uploads/1/3/4/4/134484082/zokefavakeziviki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jupevuxirapi/blinded_by_your_grace_choir_sheet_music.pdf
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_a99b52b4d184413c82b15004e2d56252.pdf?index=true
    • https://s3.amazonaws.com/fasomusogapovi/hyundai_ioniq_android_auto_not_working.pdf
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_74dad5680fb24faaae0bf29fe7959f3b.pdf?index=true
    • https://s3.amazonaws.com/rimejiguvif/the_fall_movie_2013.pdf
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_9e2476f1d8914657a14b71b71b19c798.pdf?index=true
    • https://s3.amazonaws.com/bugutaj/jajij.pdf
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_7e68dbcd09d64c86b9b5695ff7cee083.pdf?index=true
    • https://s3.amazonaws.com/tikofaketonub/healthy_eating_worksheet_first_grade.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_off000104ad.bin
4ceb392844d4da47cb076ed46ece37da6538ccba6f82c7786a7ed88ec0c4f8fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x104AD 5192 bytes
font_01_sfnt_off00011637.bin
e6a8fbd82a6dedadee676df54753a079ef32eb5e0fcd92c240228661d6d3f6cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11637 12256 bytes