Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a3815142e3ed23…

MALICIOUS

PDF

97.2 KB Created: 2021-03-30 15:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d13dfd9056a29d2f53280e9e16ddada2 SHA-1: 589b1eccb73c17ecfaf10f1726ed13e305b41fd7 SHA-256: 10a3815142e3ed23152b11bbbaea6bb9390db6fffb6f654d5d06930ab6a21f70
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 phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though obfuscated, contains keywords related to directions, likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://botokaw.ru/wix?keyword=destin+fl+directions+to+texarkana+tx PDF link annotation
    • http://xrootunited.com/105589235932du0v.pdfIn PDF document text
    • https://radokixudex.weebly.com/uploads/1/3/5/3/135342076/1b913359b25a.pdfIn PDF document text
    • http://tigafik.mygamesonline.org/barber_of_seville_libretto.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/V6rUs7A/46960301603.pdfIn PDF document text
    • http://eurostore.info/how_to_live_a_stress_free_life_wikihowpnifd.pdfIn PDF document text
    • http://fuvesozufinefi.medianewsonline.com/36494734065.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/antisepticos_naturalesrz0di.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/jh8geTn/9070911755.pdfIn PDF document text
    • https://govuvafokixer.weebly.com/uploads/1/3/1/6/131607022/mazumusavig.pdfIn PDF document text
    • https://teraxumafelenug.weebly.com/uploads/1/3/4/7/134747654/midafufejoz.pdfIn PDF document text
    • http://ninuwekevap.scienceontheweb.net/fadezemilarikoturowe.pdfIn PDF document text
    • http://faponabon.mygamesonline.org/amazfit_bip_user_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/kofosenolo/ji1qU1b/ultimate_car_driving_classics_hack_game_download.pdfIn PDF document text
    • http://vk-settings-change.online/59475238803t5y6y.pdfIn PDF document text
    • https://jagedebake.weebly.com/uploads/1/3/0/7/130738918/jigup_bepiwabofinaput_fizus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_17db16ec81bb4e53a148cbd8a2df116e.pdf?index=trueIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_1000949583e942c99f56938718985d52.pdf?index=trueIn PDF document text
    • http://nabenejajoko.myartsonline.com/rodaripuxujezaxasorop.pdfIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_71745bb02f1f42f3907873481c24f5cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4492e8b6-6535-4ef2-aebf-18545c8252e4/jabopuzevuxajen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aab20e3-a944-4c74-bb65-21cb234f39e2/how_many_calories_is_in_one_krispy_kreme_doughnut.pdfIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_185e4e8abf7246fe801996e14b185228.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00015fed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15FED 16668 bytes
SHA-256: ef1f78d51e21e827f97994ec9a031d511b620592a0487bb6fcba8ca9e6441d3b
font_00_sfnt_off00012662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12662 5144 bytes
SHA-256: 8d6f0e3ce4a9aa62d658c44cc2f642dd35a4b110801140850b168c7dbc1332ab
font_01_sfnt_off000137fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FE 11640 bytes
SHA-256: 7370e137f6f40185faac9305f264db38387cc8625ef662b094c6192f10d26cca