Malicious PDF — malware analysis report

Static analysis result for SHA-256 1afbda665d7cc749…

MALICIOUS

PDF

93.1 KB Created: 2021-02-19 18:24:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bfd79f4482dc33bba290bfdfc0a4536a SHA-1: e7e8686a1bb924eac6aebc75f676103a26b81cf4 SHA-256: 1afbda665d7cc7499dd24596f3e976ae7747d053ab0a0e4b957392c52adff599
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, many pointing to disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://jacksth.ru/123?utm_term=verb+worksheet+for+1st+grade PDF link annotation
    • http://zuvilivupeke.iblogger.org/74993300458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447437/normal_5fdc8c914029f.pdfIn PDF document text
    • https://nozinogut.weebly.com/uploads/1/3/1/1/131164424/gowejavopogex.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/blibigi/human_resource_management_system_project_report_in_java.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/komefe.pdfIn PDF document text
    • https://vigegenatiborig.weebly.com/uploads/1/3/0/7/130740049/nikubadomexenafelit.pdfIn PDF document text
    • https://faneputivodi.weebly.com/uploads/1/3/0/8/130874667/jexaduzikibuzed-gogevivu-wutelub-xezufafokamut.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/daggz6P/neha_kakkar_mp3_song_2019_list.pdfIn PDF document text
    • https://salobomuxalevi.weebly.com/uploads/1/3/1/0/131070078/bokaxifap_zuzozup.pdfIn PDF document text
    • https://tusigidufamem.weebly.com/uploads/1/3/5/3/135350313/xoxokevuja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422135/normal_6017571369a16.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/pulavokaxe/contractions_worksheet_for_year_3.pdfIn PDF document text
    • http://vonimamodiji.rf.gd/ragnarok_mobile_assassin_dagger_equipment_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/google_sheet_append_text.pdfIn PDF document text
    • http://zozikidifalov.epizy.com/john_deere_la135_service_manual.pdfIn PDF document text
    • http://nonogopikizezed.rf.gd/pasipekijejedagisapi.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/fender_2_pin_tuner_template.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/black_panther_marvel_wallpaper_4k.pdfIn PDF document text
    • http://voruluju.epizy.com/agri_admission_form_2018.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0001029e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029E 6440 bytes
SHA-256: edf517a561ed5132c6c1d5718ac6ff9d870a00e6f43a91762fd168a2279cca75
font_01_sfnt_off00011294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11294 5448 bytes
SHA-256: 216455b38be44dd6314c042a21380e57da16a6d6a0a66f835a738a0940304e62
font_02_sfnt_off00012535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12535 14136 bytes
SHA-256: 9ad0d5b0580be3400cad2aed98e6ab3f3f6b22a139948abc7f65c52be3d7b4dd
font_03_sfnt_off0001526f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1526F 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1