Malicious PDF — malware analysis report

Static analysis result for SHA-256 8939d182f73e0379…

MALICIOUS

PDF

80.2 KB Created: 2021-03-30 07:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7a9d3994a5a22ff4e2a797a70ff88887 SHA-1: 52f864bb63303e837affa2736a82660ad9ee9a74 SHA-256: 8939d182f73e0379268db4a7e2d94251fd335a239c0daf8430abf863855e922f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://xezojetit.ru/strik?utm_term=replace+toner+cartridge+brother+hl-l2360dw PDF link annotation
    • http://zemages.22web.org/capacitor_in_parallel_and_series.pdfIn PDF document text
    • http://retamos.mygamesonline.org/remifezufafozulegebo.pdfIn PDF document text
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/vejopokizesif.pdfIn PDF document text
    • https://zalajugimawif.weebly.com/uploads/1/3/0/7/130739284/tidowoxofaje.pdfIn PDF document text
    • http://gozimudowojuzun.mypressonline.com/accidental_death_of_an_anarchist_play.pdfIn PDF document text
    • http://waxawazurutane.22web.org/what_is_burger_sauce_made_of.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/5947194280.pdfIn PDF document text
    • http://tebafurunaxinuj.getenjoyment.net/bright_line_eating_vegan_food_plan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mokixetat/kindergarten_worksheet_download.pdfIn PDF document text
    • https://d429d46a-6203-486b-8c9d-ede5597e1383.filesusr.com/ugd/419b00_7c818f4582c049aa9da73dcb24bcf038.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rejiner/11594679968.pdfIn PDF document text
    • http://nowimirozox.atwebpages.com/wewowuranegasakirir.pdfIn PDF document text
    • http://dodakot.rf.gd/honeywell_electronic_air_cleaner_f300_f50_replacement_pre-filters.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/48440825311.pdfIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_fa0bd1ec66d149d38b50244dfecebd75.pdf?index=trueIn PDF document text
    • http://jumepenitujox.atwebpages.com/what_is_the_effect_of_english_language.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE625 6020 bytes
SHA-256: c9d0e352253c2e8e87248aaaa100d8f836d14fd3398651a45949b15917681075
font_01_sfnt_off0000faab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAB 10512 bytes
SHA-256: 36f9edab07fcf74b96da5afb28ad8bf9d6a96a96e71a685a605998d953e35341
font_02_sfnt_off00011eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB8 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848