Malicious PDF — malware analysis report

Static analysis result for SHA-256 115a9d904e083fa3…

MALICIOUS

PDF

76.8 KB Created: 2021-04-06 23:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 072a612a97f0397b69e217058174ad77 SHA-1: 1010b332508c9e88f71d377cdda472805fb909bb SHA-256: 115a9d904e083fa3cf797ec1315ae2b3ecd141d9a28a3f7eb7acfac7a5739ae9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic PDF_SEO_LINK_FARM suggests the PDF is part of a link farm designed to attract traffic, and the embedded URL points to a suspicious domain. The document body, though heavily obfuscated, contains text related to 'Kc star crossword puzzle answers', serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=kc+star+crossword+puzzle+answers
    • https://cdn.sqhk.co/sekijebasazi/fRizCgj/22637261963.pdf
    • https://cdn.sqhk.co/fakosopalo/iaidkje/92104317360.pdf
    • http://rokepilunip.iblogger.org/light_relief_llc.pdf
    • https://cdn.sqhk.co/vunalogivefu/lhohaR8/digestive_biscuits_walmart_canada.pdf
    • https://cdn.sqhk.co/pasepizut/ifjiifO/40503856653.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_ee83123c7fa34c34b0efe1fd5fc880e4.pdf?index=true
    • https://321e46d8-a3e9-4523-905f-b0dcd1dcb7ef.filesusr.com/ugd/29fbc3_b11c124526504cfc970224dab5580e9d.pdf?index=true
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_c251ad6da0e241448d4113553e542cea.pdf?index=true
    • http://jaziwovapotulit.epizy.com/mothers_day_coloring_sheet_for_kindergarten.pdf
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_fae2bfc4e8114794a3bb43ea4df2107a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6c5d1dfa-81c4-456e-8238-040a9315e788/mobaxalinujivafozomi.pdf
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_bf76162d37094db184e48e08bf62e3d1.pdf?index=true
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_578c04ad39e745dfb393dfbd6378b982.pdf?index=true
    • https://uploads.strikinglycdn.com/files/922cc4f5-b908-4717-91ff-e984f313db42/xewaveti.pdf
    • https://s3.amazonaws.com/muvarelo/printer_ink_hp_4630.pdf
    • http://lipewolitaden.epizy.com/sujezogomopidufet.pdf
    • https://uploads.strikinglycdn.com/files/e4f51af1-d32b-4714-9a9c-fe8042ff002b/zosemarunexasosif.pdf
    • https://s3.amazonaws.com/rupatojuko/zogek.pdf
    • https://s3.amazonaws.com/tesapibebujep/appareillage_et_installation_lectrique_industrielle.pdf
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_4f0640a037044096b3f76bdd87b3fa82.pdf?index=true
    • https://s3.amazonaws.com/sazomo/ariston_gl4_water_heater_owners_manual.pdf
    • http://famofuviw.epizy.com/big_data_analytics_notes.pdf
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_15c61af219574d55bce9ac342fe09068.pdf?index=true
    • https://s3.amazonaws.com/musoxifuvitalo/39809452416.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ec.bin
05656211d9d10ee01995b4d9151d3e69bd599274b3870733fab120b7ca62cac0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 5012 bytes
font_01_sfnt_off0000f41f.bin
b601e94e457e2c0fa85b88188f44ab09523dd77cdca4d3f00eb6bf6c3d72a6f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 10432 bytes
font_02_sfnt_off0001179e.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1179E 4324 bytes

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