Malicious PDF — malware analysis report

Static analysis result for SHA-256 acff1e51b13c6286…

MALICIOUS

PDF

85.0 KB Created: 2021-04-26 09:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8d7ac301715b22134684710f2d3c6e31 SHA-1: 1855d76565171000979080a931c463304722809e SHA-256: acff1e51b13c6286b7a306c920d15b135e4a7d81b7b622eaa42663bd443c9ff2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains an embedded URI pointing to 'https://ponafet.ru/strik?utm_term=king+soopers+capitol+hill+denver', which is likely a phishing lure. The document body, though heavily obfuscated, contains references that may relate to the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://ponafet.ru/strik?utm_term=king+soopers+capitol+hill+denver PDF link annotation
    • https://cdn.sqhk.co/dalubevemex/dhbuPje/tofalatezepejivaxavuxelug.pdfIn PDF document text
    • http://vakafubetax.iblogger.org/hungry_shark_evolution_mod_apk_free_shopping.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460055/normal_604d129423c6f.pdfIn PDF document text
    • http://rajudadude.mygamesonline.org/sifazomo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387920/normal_60057db67db5d.pdfIn PDF document text
    • http://moxipafuxoxo.mygamesonline.org/downward_arrow_technique_worksheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459166/normal_5fc82b524abe4.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/ifKbhgW/property_auction_liverpool_town_hall.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_63fb617fb5154dea9e0ebdf0f8d50a31.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1e136a3-f571-450e-a7db-e07c5e892aea/lowrance_elite_3x_ice_fishing.pdfIn PDF document text
    • http://xifimerin.onlinewebshop.net/canada_map_printable.pdfIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_21b3bf2190c644869e7755ac43b94554.pdf?index=trueIn PDF document text
    • http://femebonizajuwaj.epizy.com/do_oral_b_toothbrush_heads_fit_superdrug.pdfIn PDF document text
    • http://rexufigifex.epizy.com/yamaha_powerstroke_3100_psi_pressure_washer_parts.pdfIn PDF document text
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_2a79c85a89d74d2ab7e2856fb52cf57d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4857df0-3f75-4cd3-821b-30492f9da8bd/bissell_proheat_2x_lift_off_pet_belt.pdfIn PDF document text
    • http://kiluxelatax.epizy.com/32416022641.pdfIn PDF document text
    • https://52431b39-7396-4b0c-bcaf-ab72d449a1bf.filesusr.com/ugd/f8cef3_553d77296761400e9a38477969b27f2e.pdf?index=trueIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_841817611003444294fce1711dfbe985.pdf?index=trueIn PDF document text
    • http://petojijoxura.onlinewebshop.net/pneumonia_anak_adalah.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_off00010ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE1 5364 bytes
SHA-256: be93deb75a5133f79e8163fbea3306d9495c8c95a8875cf5255ccb07be337335
font_01_sfnt_off00011f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F26 11064 bytes
SHA-256: 6c55717b88410b47deaa2e40bc9013aa77202ee861aae7890abfc72fd1859785

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