Malicious PDF — malware analysis report

Static analysis result for SHA-256 7149f5af9708adf3…

MALICIOUS

PDF

90.5 KB Created: 2021-03-29 18:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b73f04654b168a3520ff67e4f90a9d0d SHA-1: ec3ab0a98547d27fd1a4a9b0d846f074bb9e6063 SHA-256: 7149f5af9708adf35661b7cd03e18ba098656d5d10ee81612b81e233d83fc36a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=the+eyes+of+the+dragon+sparknotes PDF link annotation
    • http://duboxol.iblogger.org/1_cm_grid_paper_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474988/normal_60109138b6479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389394/normal_601ff7f2be4b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414353/normal_605b527944623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_60152ad0280ed.pdfIn PDF document text
    • https://cdn.sqhk.co/wenejusuzixe/cjeQdgc/30016686109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495841/normal_605512901f382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_6054062fd29e8.pdfIn PDF document text
    • https://cdn.sqhk.co/mojazejo/96igELU/aneurisma_que_es.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474720/normal_5fe5b4242adb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473638/normal_605818190e97f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://latowetutut.epizy.com/customer_value_in_supply_chain_management.pdfIn PDF document text
    • http://pinamagowejut.epizy.com/70613425039.pdfIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_c314c5f407274c6490e70d0602ed32d8.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_7ab1c8c868ed4806b7c9c4a8781b65af.pdf?index=trueIn PDF document text
    • http://bemisiba.epizy.com/51353314306.pdfIn PDF document text
    • http://tarusuja.epizy.com/arris_tm822_modem_ds_light_blinking_orange.pdfIn PDF document text
    • http://kenefokugoxetu.rf.gd/national_defense_academy_form.pdfIn PDF document text
    • http://saripugoxek.rf.gd/83327863642.pdfIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_30cba453399a463aa267ae8dde7d7176.pdf?index=trueIn PDF document text
    • http://nelamatu.epizy.com/41535463032.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_off000123e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E5 5388 bytes
SHA-256: 585e1d9aa18dff1071579082bec71531266d378cdfea859337fd06fcd6e5515b
font_01_sfnt_off0001363c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363C 11260 bytes
SHA-256: 12aa4afffbb476c4b8316ab34c6cb31da56dc02e6e9bae6c93d5fdee0c0e844b

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