Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1dfb786eba41c68…

MALICIOUS

PDF

72.8 KB Created: 2021-02-24 08:32:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 989c75a118fc3d4837b058cd62be328e SHA-1: 5d010baecc559cd082c7277c9a47cf684f3b4888 SHA-256: f1dfb786eba41c68aee709e35647f284282a369a0787f0e33a00f4b0168b70c5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, indicative of a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the heuristic findings of a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://bologen.ru/wix?keyword=free+bingo+bash+chips+game+hunters PDF link annotation
    • http://idealica-ufficiale.site/amika_shail_khamoshiyan_song2enz4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483070/normal_5fd3b2c63c216.pdfIn PDF document text
    • https://pidowiwosuzaji.weebly.com/uploads/1/3/0/9/130969191/zirozefusomopuj.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/idfArjb/chat_virtual_del_icetex.pdfIn PDF document text
    • https://tojalalegeb.weebly.com/uploads/1/3/4/5/134584715/wowoxap_janalereguper_kebolofikop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_602991d683480.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/gukja7V/captions_for_old_baby_pictures_on_instagram.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368996/normal_5ff2139165925.pdfIn PDF document text
    • https://zadujogor.weebly.com/uploads/1/3/1/4/131406982/wawuwurofefese-funinorawujun-godonaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385859/normal_6028bf41db886.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/moxunusiluwiwududojey5cwu.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/jdkVNPK/wallpaper_hd_whatsapp_dp_attitude.pdfIn PDF document text
    • http://instgramcopyrightdispute.com/rapetarunadofix9axq.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/fb58e1f421656bb.pdfIn PDF document text
    • http://steblin.pro/terraform_azure_storage_account_network_rules3n3j2.pdfIn PDF document text
    • https://cdn.sqhk.co/nemazuwigumo/edj0Nle/datidarezediridemugafir.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxozowaki/XsVoGC8/demuridavijonopowudomedod.pdfIn PDF document text
    • https://folodekoj.weebly.com/uploads/1/3/2/8/132814523/zivoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496005/normal_600928c7e5ca4.pdfIn PDF document text
    • https://cdn.sqhk.co/lamidipeke/hn5sjaB/multicraft_free_miner_2.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/zepunezuzisowofdojee.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
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DE 5292 bytes
SHA-256: fa56458f5e6cb4c51e3d241bd3c1731e4f1d8c6222b218ac48dde7a65b083f04
font_01_sfnt_off0000e5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AD 9928 bytes
SHA-256: 36be39a43dd08c953bd58a9d6d025272b7653ccda3720f0529447ad5fe2f50dd
font_02_sfnt_off000107b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B8 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333