Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3570f67186ad98…

MALICIOUS

PDF

82.3 KB Created: 2021-06-07 09:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 16546dea8c2a5226285b255a43bec56b SHA-1: b56b28c65d8bfa471589e0a3f69d98f45cae5472 SHA-256: 3f3570f67186ad9844ec84ac4352a7b9c44b3d5e21d8efe623f668ee346e8393
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 0.9967

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://golowaki.ru/123?utm_term=family+relations+worksheets+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500667/normal_602770fb864b7.pdfIn PDF document text
    • https://funovupudejo.weebly.com/uploads/1/3/4/4/134473131/digobazolinato_kurojimap_julixijowarusi.pdfIn PDF document text
    • https://tenipimip.weebly.com/uploads/1/3/4/0/134042327/cc7eda65f.pdfIn PDF document text
    • https://bolusawowena.weebly.com/uploads/1/3/4/8/134894851/pilonozasef_rutodag_basasezur.pdfIn PDF document text
    • https://fotavisemaro.weebly.com/uploads/1/3/1/4/131406710/merogurugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463803/normal_6051e255452d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476446/normal_60262830cfdae.pdfIn PDF document text
    • https://zegimobigew.weebly.com/uploads/1/3/4/3/134313375/vetivaro_toxezowi_kirumiwukamile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503533/normal_5fd99db022e32.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gaxoxim.pbworks.com/f/93338339995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0369852b-c05e-40e2-a1d5-8cdad339fd53/9th_grade_science_vocabulary_words_and_definitions_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1deac6d1-35ad-484a-b960-169c0bee4dda/gufusijep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c00ad07e-c01b-42f9-8b69-97e38992b0c0/xufatesutij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ae93c27-0e74-4c2b-be9c-893c0709a8c2/3556628844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/184160bd-48ea-491a-9ed2-a859252cd392/beats_solo_2_wireless_change_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/241ccd52-7e3d-42b2-b6d1-2d0d79b8e356/robagafegux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40ead219-949d-412b-8b81-ac5da13932eb/mafexufawegujugowizofemow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ec68683-99b3-4918-8d13-066e45c55408/nosasasixoletub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60c7b878-8037-414f-b370-50b4a6acf2d2/piwevosuva.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/w/file/fetch/144575943/life_sciences_grade_12_mind_the_gap_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f29580df-7611-4d57-a368-e17551d45229/football_manager_2015_best_players_for_premier_league.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85e8f594-246f-4b5d-ad2b-27e6b9b6c49f/79046677352.pdfIn PDF document text
    • http://nosegawibaso.pbworks.com/f/putobunam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30fe660e-3ba2-4b1a-b2c4-18a755be5feb/willy_wonka_and_the_chocolate_factory_full_movie_streaming.pdfIn PDF document text
    • http://dagomiwavi.pbworks.com/w/file/fetch/144548166/7087155866.pdfIn PDF document text
    • http://jukozatixul.pbworks.com/f/free_printable_minnie_mouse_baby_shower_invitations_templates.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 5496 bytes
SHA-256: 2d41290dafe90658472d7bd64d3faa62b5be3928f6be6f73824ee098b365198d
font_01_sfnt_off000116eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EB 10812 bytes
SHA-256: 5d963f3f22d57622cf647743c1ca9445119e7460929c15ea61ad75c36dbb816f