Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c3174529c34474…

MALICIOUS

PDF

85.4 KB Created: 2021-04-04 10:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 927c70354afe6dc62b280c231b85ffff SHA-1: 510fdabdc53100c92780290cad2ac03d6391c798 SHA-256: a8c3174529c34474f16e4f3d2c6855cdb71da29321910c4f67fabbc09aee030b
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 0.9990

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://botokaw.ru/award?keyword=attenuators+and+equalizers+pdf PDF link annotation
    • http://samoe-samaya.ru/2003_ford_ranger_manual_transmission_fluid_typeafg02.pdfIn PDF document text
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/zugozaveluxadowava.pdfIn PDF document text
    • https://lepifopinitomo.weebly.com/uploads/1/3/2/6/132696280/3042158.pdfIn PDF document text
    • http://job-finder.space/wumesapatuwugewojokofajeg5xyy.pdfIn PDF document text
    • https://defelidiko.weebly.com/uploads/1/3/1/0/131070982/fawipaxamaxokido.pdfIn PDF document text
    • https://lanedipeluta.weebly.com/uploads/1/3/4/6/134666686/sefewivek.pdfIn PDF document text
    • https://josusijino.weebly.com/uploads/1/3/0/7/130739082/dupajazunobugojotiz.pdfIn PDF document text
    • https://xitukamobem.weebly.com/uploads/1/3/4/6/134643312/moxibadepojerume.pdfIn PDF document text
    • http://xemokajoled.medianewsonline.com/probability_random_variables_and_stochastic_processes_mcgraw_hill.pdfIn PDF document text
    • http://sravniproxy.info/data_warehouse_vs_data_mart_vs_cubelz5tq.pdfIn PDF document text
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/domorapitikadej.pdfIn PDF document text
    • https://xikuvisaduwobax.weebly.com/uploads/1/3/5/9/135962120/nuraze_dekaziwo_buwetuleji_biwozupebi.pdfIn PDF document text
    • http://peteferix.mypressonline.com/kelixomuborowibosos.pdfIn PDF document text
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/visewolun_pewuxuzojafiz_sutiwugutu_dutorupowosafe.pdfIn PDF document text
    • http://disclosures.space/zibexogutoxejusezuvudirgl20.pdfIn PDF document text
    • http://goodsun.space/lononymqea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb1ebcd4-7948-4b1b-8907-739abca5abbe/mediwinenoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/203afa4c-3eb2-463c-9323-304346d3b2f6/usps_first_class_mail_international_tracking_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be68fc7-60bc-4c6e-ad9b-695fa9c6b36d/midland_gxt_1050_frequency_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4000d828-124b-410f-ad72-ff7315ea0ae9/cells_alive_worksheet_answer_key_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4459617a-5a60-495c-be60-2f8c23ab4e1d/50_shades_of_gray_book_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1c0349e-989f-4e3a-8622-c150532dcb91/parrot_mki9200_bluetooth_car_kit_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50266982-78a8-4296-9b94-4d146e424d26/what_size_is_30_by_40_cm_in_inches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a2d032f-0409-463e-991c-6e4f6ed7a6fe/where_is_wps_button_on_netgear_nighthawk_x10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25925d3d-5955-4f11-882b-30af3c78b867/clean_living_norfolk_carpet_cleaners_dereham.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB3 5200 bytes
SHA-256: 1e681e915f7bbaf6b3d4c557cf575752afbbdfc0d7b1ebfca2145eb1ae634d03
font_01_sfnt_off00010c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C77 11272 bytes
SHA-256: ff0e75370b99cfd27808d5b76a6f4e599ba0e1dff0ebac35bbb5d30e95ba7fe4
font_02_sfnt_off0001335b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335B 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb