Malicious PDF — malware analysis report

Static analysis result for SHA-256 764b76bb2d1bb243…

MALICIOUS

PDF

87.6 KB Created: 2021-05-23 05:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4dd3bff0f72087063711e8acf66d62c5 SHA-1: 726fb3cffad4c6f8d8021611afcf24c928406b78 SHA-256: 764b76bb2d1bb2435ac741abb316a5f5800c380b238b3006b68e68bc64cbd6e5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/strik?utm_term=how+much+it+cost+to+get+a+chick+fil+a+franchise PDF link annotation
    • https://dimutaribosisup.weebly.com/uploads/1/3/4/4/134444719/jegamen_gulebizit_jepizugije_waxozeko.pdfIn PDF document text
    • https://laxaxaxiw.weebly.com/uploads/1/3/4/5/134528460/7426775.pdfIn PDF document text
    • https://fadirepux.weebly.com/uploads/1/3/1/4/131438814/7508607.pdfIn PDF document text
    • https://witufulovavivoj.weebly.com/uploads/1/3/4/3/134351467/8240709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387411/normal_6017bfe6b7be0.pdfIn PDF document text
    • https://magapevalapa.weebly.com/uploads/1/3/0/8/130874167/rofumepijomo.pdfIn PDF document text
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/0e10ad22070297.pdfIn PDF document text
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/4c70d938e6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408460/normal_5fda67ef9d690.pdfIn PDF document text
    • https://fotagajumiveba.weebly.com/uploads/1/3/1/4/131411987/desujuriwosadu.pdfIn PDF document text
    • https://xoxazibazosilex.weebly.com/uploads/1/3/4/5/134590820/zabuwiridaru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450415/normal_5fe536a9ebc6c.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
    • https://s3.amazonaws.com/bisapovepizaj/diwojekotupuninewarugugud.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/conditional_formatting_google_sheets_entire_row.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4da5b8ef-f808-4be7-a14b-0c8cc4349853/fourier_analysis_an_introduction_elias_m._stein.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04d64df6-398c-476d-a446-a07057a68b09/el_caballero_de_la_armadura_oxidada_resea.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90edfb52-c741-4836-8d77-7741463b8ef6/what_is_the_best_stationary_bike_for_the_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dad4297-5e30-4578-9f50-5b16569809c8/could_be_used_to_measure_the_rate_of_photosynthesis_in_a_plant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b356132-9ab2-430e-9d66-f72e0e1eaec8/girl_with_the_dragon_tattoo_swedish_actress.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c97faff6-a84b-49e9-a0e7-b2fb0e145790/garmin_nuvi_2595lmt_software_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70256f41-49df-49be-a125-95fefe4c6462/vufakujogurusonagarusalap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d73253f-f103-4901-bb73-9e6d147cfe1e/68375685617.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA4 5296 bytes
SHA-256: 1bb46a148d3f4c3d553e982d8613bda7a5974705dd154c843263bbdb2f50c9dd
font_01_sfnt_off00011c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8F 11188 bytes
SHA-256: 2b0eb3604280239ac709c33f2bf03aee934dc5ddf0a328c672da96be424d925d
font_02_sfnt_off000142a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A7 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71