Malicious PDF — malware analysis report

Static analysis result for SHA-256 669c8a78f399321d…

MALICIOUS

PDF

72.2 KB Created: 2021-03-22 10:19:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cd2b7570ac2fe4bb28bec99c4fb029e0 SHA-1: 7bc33a05b84ec6cb045c5c0040a5ac123631e7a5 SHA-256: 669c8a78f399321d5e156a8ae593064e5b61bd66511d2f5f1e03692eea10cde8
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://xezojetit.ru/award?keyword=retirement+definition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490274/normal_5fd1bcbb13acd.pdfIn PDF document text
    • http://xapiduxirob.mywebcommunity.org/72288691567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411229/normal_60146ed720cb6.pdfIn PDF document text
    • https://kogevinipuban.weebly.com/uploads/1/3/4/5/134514077/3297220.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366000/normal_5ff1463734d9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373271/normal_5fc9b1d800dd2.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/werirevotidozezuja.pdfIn PDF document text
    • https://cdn.sqhk.co/dutararopat/bn9d5rS/78531697149.pdfIn PDF document text
    • https://tixonanixob.weebly.com/uploads/1/3/4/8/134890866/71f5f1665422f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531626/normal_601584af7ab9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388818/normal_60289e1c9fa37.pdfIn PDF document text
    • https://cdn.sqhk.co/webegodebav/giZz2XX/93038633108.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/wuwibawusovesosofofa.pdfIn PDF document text
    • https://kejarokelevu.weebly.com/uploads/1/3/5/2/135297316/7107461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418399/normal_603dea7bbc276.pdfIn PDF document text
    • http://baliferifopiz.mypressonline.com/breeder_reactor.pdfIn PDF document text
    • https://cdn.sqhk.co/fasisela/jchbjfJ/toan_dan_tam_qu_c_apk.pdfIn PDF document text
    • https://wizenifove.weebly.com/uploads/1/3/4/3/134308138/7755962.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408352/normal_5fccf3c45224d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461777/normal_60226f48967e9.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/ac092f18-e7e4-4faa-93da-69b5eb004526/29_duraflame_infrared_quartz_electric_lantern_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bffca1f6-36e8-435b-9b68-bb8674e2986d/76117686353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dda4ec66-4a7d-4561-93fe-7aa0a9a23027/how_to_write_a_short_poem_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/215f9b8f-52c4-45d9-bcb1-a971df0170aa/i_can_no_longer_wait_take_me_to_united_states.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_off0000d16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16A 4560 bytes
SHA-256: 2ad1a101fe64d969412227d25d562087ac1c3e0ea7fa859bc142e694145d5991
font_01_sfnt_off0000e0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D2 10692 bytes
SHA-256: 1f28a34a88c4b73141a0808be88c8f5899c372e6c0679694a7f5ab05a7c84b19
font_02_sfnt_off0001054b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054B 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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