Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61ca35b6d6726d7…

MALICIOUS

PDF

73.3 KB Created: 2021-03-29 13:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a669571d9454924381ca796f50eba4fa SHA-1: 5147649e6e6471318b466c51488b42bbbe10de90 SHA-256: c61ca35b6d6726d7d34288a333e71f4dede4065e36b14eae53b38ee595b5c63d
186 Risk Score

Malware Insights

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

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 0.9996

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://fokemale.ru/strik?utm_term=is+pdf+architect+safe PDF link annotation
    • https://sefagovat.weebly.com/uploads/1/3/4/4/134402874/c19277a16.pdfIn PDF document text
    • http://midarujiwuvi.mygamesonline.org/how_to_be_a_scout_sniper.pdfIn PDF document text
    • https://sudesiresa.weebly.com/uploads/1/3/4/8/134881981/valabuguk.pdfIn PDF document text
    • https://rivixajonezil.weebly.com/uploads/1/3/1/4/131437445/tavubepidiselij_waloki.pdfIn PDF document text
    • http://zuwifipenabed.medianewsonline.com/9070304501.pdfIn PDF document text
    • http://giocodigital.website/free_printable_worksheets_verbs_first_grade7nvbv.pdfIn PDF document text
    • https://dosedupuwosiwoz.weebly.com/uploads/1/3/0/7/130776272/luromefezojufigivi.pdfIn PDF document text
    • https://geworusidexaj.weebly.com/uploads/1/3/5/3/135306562/bamaguxolar.pdfIn PDF document text
    • http://creditinquiry.info/86315310581cmnfk.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/progressive_emergency_physicians_emergency_medicine_physician_assistant_fellowship.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/90977995603.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fddfacfc-dcc2-416f-a200-ae5e15b952e2/logitech_k250_wireless_keyboard_unifying_receiver.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_152ee7e9cff2430296ab9fe34100a03b.pdf?index=trueIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_6888973b7a7840e8a7888b205bcfa941.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/389de6cb-f92d-443c-83e5-a3ceb777c11a/how_to_get_my_hp_printer_to_scan_to_my_mac.pdfIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_27aa46ad59e64b9fa3330ed4ba9cf90a.pdf?index=trueIn PDF document text
    • https://901b9152-9067-49c5-8541-bb90c1a77dfa.filesusr.com/ugd/5d84e8_62987aa818134a05884f6970b566f024.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bc0b0c6-6eaa-4324-9b41-37f374a04d50/70594669187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf6549b-0ba0-4bfc-93b3-81b00e935156/shell_scripting_tutorial_point.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e8b8a13-ec1c-49f2-86b3-05d56b1ee170/the_real_christmas_book_c_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba49c10d-1a7a-48e5-9642-dd1f77a5c094/paxarozigimeva.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_a4c7077a0a5e4361b4dfe4b2c52121af.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 5148 bytes
SHA-256: c3dec9db5d14b132b3a411a3625eb371c792e4b45e32ca8f235b7b6f024ca5eb
font_01_sfnt_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 10452 bytes
SHA-256: 7a1cdcf13c8ad33ca23fb3012e00b610a1d78f782c33b21ad5f0ac55cc45b3b2