Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ca17fb4afc02a2…

MALICIOUS

PDF

82.1 KB Created: 2021-03-29 20:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a2c6f0d0f4d7e195d51941bec423b0a0 SHA-1: e24429eda81bba8aabc67c64b26232a0a42e0b33 SHA-256: 70ca17fb4afc02a277c3ff275eddf4fe705044e68cd0e1ff0688701966ce3ccf
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs is the primary indicator of malicious activity.

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://ponafet.ru/strik?utm_term=rudolf+schwarz+and+the+monumental+order+of+things+pdf PDF link annotation
    • https://patawera.weebly.com/uploads/1/3/4/1/134131312/keganemifofob.pdfIn PDF document text
    • https://totaduwuvib.weebly.com/uploads/1/3/0/9/130969262/pevete-gawulaz.pdfIn PDF document text
    • http://putijeku.22web.org/oxford_discover_5_workbook_download.pdfIn PDF document text
    • https://tanibabinilez.weebly.com/uploads/1/3/4/0/134018029/903751.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5f2b6ceb-2cc4-4ca1-91d2-0c3d357264ed/maxexelijop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c130af5-f128-4339-bba8-d1be6c792506/what_is_technical_writing_apex.pdfIn PDF document text
    • http://pikarofuwab.epizy.com/achalasia_cardia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa03f7e3-9aaa-4d15-83c9-a1924dca6e0d/95354659403.pdfIn PDF document text
    • http://fejiremow.epizy.com/zexifofezix.pdfIn PDF document text
    • http://wijogural.epizy.com/4967065040.pdfIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_8b94d12fb12143aab8b7098e57a88f88.pdf?index=trueIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_7d6c4a72965949daa4cec15b8acf09b8.pdf?index=trueIn PDF document text
    • http://perorudo.epizy.com/89306234245.pdfIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_4b4d2dede0a747cb812bd1ef18853ab3.pdf?index=trueIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_cb766d142db945d690d0b5ff81e0db21.pdf?index=trueIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_c57d1c843a4744b5935b75e2b71d6eb5.pdf?index=trueIn PDF document text
    • http://daxokefi.epizy.com/17162617445.pdfIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_b72105ff4f8d47d6bd3064f583075e18.pdf?index=trueIn PDF document text
    • http://ganuxujerotapu.epizy.com/free_guided_meditation_apps.pdfIn PDF document text
    • http://zunedolu.rf.gd/dezukazekoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a543386-a4f6-4bea-a4fa-5e38066c9a7f/juladutir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/166c28e5-23f6-489a-8028-f9977495ed03/dietas_para_bajar_de_peso_rapido_1_semana.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 5600 bytes
SHA-256: f258a5899f819ec4f8f13d01a518e55b63b989107827aa1a368b5b424c8c8c18
font_01_sfnt_off00010487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 11860 bytes
SHA-256: 0e968ec4713a57db1289e8e82a64d37c652b288c78e637447cf258729f7a62a1
font_02_sfnt_off00012c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176