Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bd2fab7908b2d4…

MALICIOUS

PDF

77.2 KB Created: 2021-03-15 17:52:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 663209baa74d8c99b9c04c44f8d3ad33 SHA-1: bc0c43ea80027290b96420fab20c8624fcd2a406 SHA-256: 86bd2fab7908b2d4d51c77f62991abaab08e6ba09c876cf85d3227562b09f362
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, indicating a link farm or phishing attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification yielded a high probability of maliciousness. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=united+states+latin+america+imperialism PDF link annotation
    • http://kigirifaduguv.getenjoyment.net/harbor_freight_13_drill_press_review.pdfIn PDF document text
    • http://foramodosug.mygamesonline.org/juburezolujapidu.pdfIn PDF document text
    • http://saroforati.medianewsonline.com/loxivom.pdfIn PDF document text
    • https://nonafinawajag.weebly.com/uploads/1/3/4/3/134331790/1348cb65b41e9b.pdfIn PDF document text
    • http://fakaluwu.scienceontheweb.net/boolean_algebra_class_12_computer_science_notes.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/62646677312.pdfIn PDF document text
    • https://zuwogirunuwexi.weebly.com/uploads/1/3/5/3/135331524/luwegidod.pdfIn PDF document text
    • http://nuvagefo.medianewsonline.com/mulanopolevetoxutavor.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/blood_bowl_list_of_teams.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/72599378829.pdfIn PDF document text
    • https://sezitoxonuga.weebly.com/uploads/1/3/4/8/134886233/9174429.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/acurite_wireless_indoor_outdoor_thermometer_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_d1bec6576f5549989c38aa8636e16761.pdf?index=trueIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_ea9f00290ac04388a7cfcba84f779e02.pdf?index=trueIn PDF document text
    • https://9ffa65b4-b95e-481c-977d-2cf6acaa57d7.filesusr.com/ugd/f68d46_f9f6b9bc9c9740e0a954f7e349090e02.pdf?index=trueIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_05c23de4eab64886ba4be24b34f0ccc2.pdf?index=trueIn PDF document text
    • http://laxolagodofomug.onlinewebshop.net/tojipemesojogowen.pdfIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_767bb168be0d45bfa7284b5ef21684c2.pdf?index=trueIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_88be518c3b4f4d1480b7e7b818f9bb7f.pdf?index=trueIn PDF document text
    • http://supuwevul.atwebpages.com/juwidobu.pdfIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_5bec5000b59b4119a6ba80b18f746e24.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_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 5212 bytes
SHA-256: 1e84a40c459e3e1f9eba776ad86010186eb39f3537e2553ec1d0758aa0084f25
font_01_sfnt_off0001007c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007C 10968 bytes
SHA-256: 8b850cbf159ba7671d36ffe0736cff6768da0c744cb498a4e96b340e23822ff8