Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35f77cdde7f64c0…

MALICIOUS

PDF

83.6 KB Created: 2021-03-19 16:27:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 101a7e2c082a76d2d02951bb8f97698a SHA-1: e932d34005a7d6cdeeb217bb357e6225a88aceda SHA-256: f35f77cdde7f64c0627371d84d103bcea76ae8dd9ed65c4da8369c05181a8cfc
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The embedded URL 'https://bologen.ru/123?utm_term=blame+game+information' is likely the primary lure, disguised as 'Blame game information'. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=blame+game+information PDF link annotation
    • https://cdn.sqhk.co/fumamimed/tTlgc5T/nifizune.pdfIn PDF document text
    • http://wurulef.22web.org/sodofutifavifazutura.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/XgiSKMt/ben_hill_umc_atlanta_georgia.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/dhexCib/reflexiones_para_la_vida_en_audio.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/feBDcgd/97941337997.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/jjgcjiX/bluestacks_hd_app_player.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/UdjgQZL/widozitalekuxidiruwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_381a5a376c994f5fa619187d0ff3e586.pdf?index=trueIn PDF document text
    • http://bewojux.epizy.com/mini_dv_tape_player_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/animated_presentation_maker_free_full_version.pdfIn PDF document text
    • http://xuxuxal.epizy.com/anjali_cbi_movie_tamilrockers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0da9ce7-f7d7-4eb0-825b-5d862b5c6210/the_power_of_positive_thinking_book_by_norman_vincent_peale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8fdcd35-d172-4df6-ad8f-57e307cd58b3/future_verb_forms_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7489df62-8ec2-45de-ad61-b0feff8bd613/33348753559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bfacef7-729e-4537-ba46-e748b601f5d4/singapore_math_workbook_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/dns_block_ads_android.pdfIn PDF document text
    • http://makuvekate.rf.gd/twenty_thousand_leagues_under_the_sea_quotes_with_page_numbers.pdfIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_8949b8aef7d94029b0076b535c0141f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c1b01ed-678c-4da2-ba75-16cf92d3d1b7/world_map_with_continents_and_oceans_labeled.pdfIn PDF document text
    • http://lisafakuxe.rf.gd/gosadawadutomeviponunob.pdfIn PDF document text
    • https://dce579ed-4708-43c3-aaeb-2c76a6268d78.filesusr.com/ugd/944939_defd8e72c9f74c7f85bbac1528dd1a1c.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A41 4960 bytes
SHA-256: 20c7448d0269869a0bd1438aff240800b863886ec5d51f3ac12d152abacd2309
font_01_sfnt_off00011b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B11 10748 bytes
SHA-256: 0ea9c33bd9eb7fa15a8287d4d23d9099dcba87a1ca9de700396a4bb296bf8791