Malicious PDF — malware analysis report

Static analysis result for SHA-256 a116a0b24e2a4a75…

MALICIOUS

PDF

91.8 KB Created: 2021-04-25 01:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e6736ca961186d5aa430a5a7d9a3ae92 SHA-1: cbe82d6555728e4efc874057ad6c4ef2ce449f23 SHA-256: a116a0b24e2a4a759605e512cf7c7b6a8d6962589c49beb16369a7501f7646ee
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL leading to a suspicious domain (`baarspo.ru`) that is disguised as a free translator tool. This suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://baarspo.ru/strik?utm_term=traductor+ingles+espa%25C3%25B1ol+pdf+descargar+gratis PDF link annotation
    • http://busimaderule.mywebcommunity.org/pdf_to_word_ocr_vietnamese.pdfIn PDF document text
    • http://naliputa.mywebcommunity.org/bsc_magazine_march_2020_free_download.pdfIn PDF document text
    • https://babivefe.weebly.com/uploads/1/3/5/3/135312435/rewosoke_favom_gonajanovogizis.pdfIn PDF document text
    • https://dutudofedibajun.weebly.com/uploads/1/3/2/8/132815365/xirivukove-jemefoko.pdfIn PDF document text
    • https://pojebozotez.weebly.com/uploads/1/3/2/6/132695867/kodozagunirovipumowe.pdfIn PDF document text
    • https://vosojexurixug.weebly.com/uploads/1/3/1/0/131070535/0a62283.pdfIn PDF document text
    • https://luredirimepopes.weebly.com/uploads/1/3/4/5/134590269/dovazubolufi.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/59e2343e-d050-4c59-b00b-cda38f634b01/how_do_you_program_a_universal_remote_to_a_magnavox_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86550754-cbf7-4485-b165-61b6e3edab82/where_to_get_my_sewing_machine_serviced.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fe72fae-b898-4768-8bc5-676de2a396bf/87126170982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00274b62-fb43-485b-96f5-3e8abea4d7cd/asp_net_core_windows_authentication_authorization.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/sumusenutijorokegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33dc9bdc-dc44-4e15-89d1-0fb56f950a31/nudatawilifodexoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f28ce6-dfbb-4cd9-bbff-cf2097562996/small_engine_rebuild_shop_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/206f6c90-a30b-422d-926d-a6c5c8633018/super_mario_land_gameboy_level_berspringen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ae44882-b283-45e3-821a-50287f9599c5/what_does_4c_code_mean_on_samsung_washer.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/affidavit_of_single_status.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/todawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d4b9061-ac1f-4322-ab08-6e0e052b9298/15289715879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1124828-23e7-45cc-82d1-da7d00e1045c/whos_afraid_of_virginia_woolf_title_explained.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a54e6362-0f62-44bf-88de-c0421aa27eef/wabigilejiwup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0a3e68d-1bc4-48a7-b6c4-9de5c14b9b70/ucsd_biomedical_library_study_rooms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/180a0206-d281-44cc-b1ee-5f5bf8f17d0c/samsung_series_6_6500_plasma.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 5484 bytes
SHA-256: 947af9f43341d5cdda4167b9478432be9d45385f7bcc6843cd08e140678f2070
font_01_sfnt_off00011753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11753 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00011fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE0 12712 bytes
SHA-256: a3f941ac8a2e5174a46a74c822fc5bbf9d3477a396b858df9cd031ab8686730a
font_03_sfnt_off00014965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14965 16120 bytes
SHA-256: a6adda8c55621593c766ab656cb214079044c73a84363db2f727c69d298f18e1