Malicious PDF — malware analysis report

Static analysis result for SHA-256 501934588cb3358f…

MALICIOUS

PDF

98.7 KB Created: 2021-03-29 03:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 975a2af1acf6db420b4e28bab2c085e7 SHA-1: 5731228263821c136d79bc046f486a1603b3a908 SHA-256: 501934588cb3358fadd80653ae1c6fa51a658b116d0cb737a617be28d196ffbc
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('golowaki.ru') that is likely used for phishing or to serve a second-stage payload. The PDF structure and embedded content suggest it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://golowaki.ru/wix?keyword=yi+fang+boba+sawtelle PDF link annotation
    • http://thechambre.xyz/george_foreman_panini_grill_targetvuzrb.pdfIn PDF document text
    • http://lusaxesa.iblogger.org/gst_information_in_marathi.pdfIn PDF document text
    • http://my-favshopc.online/king_lear_summary_act_4_scene_63zt7u.pdfIn PDF document text
    • http://kusafomidufe.mywebcommunity.org/nosupaxoser.pdfIn PDF document text
    • http://libopadu.scienceontheweb.net/82678433912.pdfIn PDF document text
    • http://copyrightprivacy.site/xotojuliwoxuzojanicgmdo.pdfIn PDF document text
    • http://xititarosoki.iblogger.org/.pdfIn PDF document text
    • http://povisowalikim.scienceontheweb.net/cessna_152_flight_manual.pdfIn PDF document text
    • http://kellys.space/zavozusobajatefipirukotisrgzp.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/ielts_general_writing_task_2_vocabulary.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/ea0d94e9-60a9-40e7-9eff-71fbdcfa1c6e/what_do_naval_officers_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1a85baf-75bb-411e-8428-8c94d30841f6/fuvituzidawalitavulevok.pdfIn PDF document text
    • http://zapudeni.epizy.com/feriri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/babb6da8-43f6-4ce9-a5ed-5d931316abbb/companies_sometimes_convert_receivables_to_cash_before_they_are_due.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0388cc84-fc55-4aee-979a-25692449c879/bell_jar_definition_and_function.pdfIn PDF document text
    • http://tawosowi.epizy.com/alternanthera_sessilis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67e4498e-a512-401d-999b-81a5ccd1b551/191663039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/131412f1-f81a-4b06-a121-68cda2440095/34912832005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/928485c6-8c5d-4b8c-8846-57c5f0c98257/equation_standard_enthalpy_change_of_combustion_of_propan-1-ol.pdfIn PDF document text
    • http://jumuvurerurulap.rf.gd/vasigabusizesujex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8858a779-b439-4e84-ba34-a242a4df9ed8/siduzadimenisuwuwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe50c967-ba7f-4137-a083-3f440bba95a1/66595123299.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_off0000f0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E5 26532 bytes
SHA-256: 81f3c1bf1a636928cb8c90bb62049f9f867267689f914fbd618af3b973111b0c
font_01_sfnt_off000141d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D7 5032 bytes
SHA-256: 0babae49a25f8f1d759f4dce1f92fc20227cacdc21a6ceb92a045e6597393945
font_02_sfnt_off00015324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15324 12664 bytes
SHA-256: 45646b44fea81ad13df3440a0c266d07eb0bcfcde088e2f1c8dbc79d4940e737