Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a90a584bb49f67f…

MALICIOUS

PDF

84.0 KB Created: 2021-03-30 10:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 73635c5c1d30e0d638ecb675cc0fdbaa SHA-1: c77f11a5d54cc375db863d3918da0fc5d303e0ee SHA-256: 1a90a584bb49f67fb5da1788e4d3b168358380a6fb015dc41930ee9bde03ec74
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://bologen.ru/award?keyword=bsc+zoology+pdf+download PDF link annotation
    • http://luwinilulurop.mywebcommunity.org/6352598469.pdfIn PDF document text
    • https://cdn.sqhk.co/fopikudapom/hajeiaO/73636758887.pdfIn PDF document text
    • https://rojanekawuveruj.weebly.com/uploads/1/3/1/3/131380666/sibifa.pdfIn PDF document text
    • http://gaxesujite.medianewsonline.com/modern_refrigeration_and_air_conditioning_18th_edition_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/fKijbii/defender_marine_free_shipping_code.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/Ljcuegd/pixel_gun_apocalypse_6_a10.pdfIn PDF document text
    • http://kosonetibekub.medianewsonline.com/libro_el_arte_de_seducir_para_dummies_descargar_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/jabezoxujo/jehgjhW/binary_code_chart.pdfIn PDF document text
    • http://warewakeb.sportsontheweb.net/beef_biryani_recipe.pdfIn PDF document text
    • https://cdn.sqhk.co/wesaduleb/w48iaOC/5756424689.pdfIn PDF document text
    • https://lotureze.weebly.com/uploads/1/3/1/3/131379444/vixinuv_bikof_zedekuxoxo_bewuvopad.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/Ry0gejh/68585830960.pdfIn PDF document text
    • https://cdn.sqhk.co/banuluwopote/jjhif9L/mizogidorikide.pdfIn PDF document text
    • https://cdn.sqhk.co/talokelom/dawYFTi/birddogs_pants_with_or_without_liner.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/y3egdjd/urban_racer_3d_download.pdfIn PDF document text
    • http://bulibujirifubof.scienceontheweb.net/carlos_slim_helu_biography.pdfIn PDF document text
    • https://rofovotojoroko.weebly.com/uploads/1/3/4/8/134878837/rebofejulek-bajoriko-wuxebu.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/21823577413.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://lewinozed.atwebpages.com/behavioral_finance_and_wealth_management.pdfIn PDF document text
    • http://tumofif.rf.gd/applications_of_queueing_theory.pdfIn PDF document text
    • http://tapejufujol.epizy.com/aamc_practice_test_1_answers.pdfIn PDF document text
    • http://segukilu.epizy.com/33533899400.pdfIn PDF document text
    • http://roniderekatitim.rf.gd/employee_onboarding_presentation_template.pdfIn PDF document text
    • http://gavikexodipel.rf.gd/98979033826.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_off0000e682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE682 5520 bytes
SHA-256: b02f8c884f5c5910e36a4918fa5acaab41dd4932d99d5bb28f713c383a68d09e
font_01_sfnt_off0000f98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98E 3204 bytes
SHA-256: 35c0a746fcdf55e64f2ba55209f6a139fa5d4ea47dce36c63c78d1e6d66b29b6
font_02_sfnt_off00010687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10687 10656 bytes
SHA-256: af39dfb8b9cd4c62eb3cfd4ed6fb4b4810f1a6bceabc46196a6ed4fc77896426
font_03_sfnt_off00012b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B20 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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