Malicious PDF — malware analysis report

Static analysis result for SHA-256 5702c5bd77b1de52…

MALICIOUS

PDF

77.7 KB Created: 2021-03-29 22:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f0e3cd1eab52627bfdf298d6897a74db SHA-1: 9811f09c843f370fc118fc5a93f09b9ee7391036 SHA-256: 5702c5bd77b1de5223727e2f44500a8c989094563948b115f264b22247e897e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9960

Heuristics 5

  • 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 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/award?keyword=huduma+number+application+form+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386822/normal_6029ff7f80f7c.pdfIn PDF document text
    • http://iciko.xyz/a_d_m_k_amma_songsk9lj7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426677/normal_603a7d5ba30a0.pdfIn PDF document text
    • http://importants.space/equation_of_a_line_examples_and_answers4bsfw.pdfIn PDF document text
    • http://duplicwcnj.space/relekoiacdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416671/normal_60420b8702426.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480187/normal_5fd05934dc27c.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/cerita_fiksi_anak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476015/normal_5ff772f8e0cd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386334/normal_5fe98a0ae0ab5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387035/normal_604d491ac30ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496605/normal_5ff1ad1e9796b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482872/normal_601eff9849010.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464077/normal_5fe24adca38aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_6061c6c6de25a.pdfIn PDF document text
    • http://saporik.scienceontheweb.net/betatron_accelerator.pdfIn PDF document text
    • http://kupivse.xyz/seeleys_anatomy_and_physiology_book_9th_editionpu0zp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426407/normal_602ed0b66956e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476007/normal_6009cb66b4e1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490274/normal_60338a44a2d22.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/62727777-da34-402f-b397-8dd399d4281f/jareboxelatazowurod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6348ff87-0885-4819-a416-38c00cbee6ee/jibugewerinenilaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5d712b9-f1d1-46bf-867c-34c25331c6dc/how_to_do_a_pre_lab.pdfIn PDF document text
    • http://gamelaluwer.myartsonline.com/oblivion_game_of_the_year_edition_strategy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a248870c-48bb-47fc-83e2-40c8725dbff0/how_to_sync_sharper_image_wireless_headphones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f316141-07c5-4217-b778-07bc263f89a8/dazufuzosulubamujurezug.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 5224 bytes
SHA-256: eedf472cc20566c3297ff43c2026d3377e6c27a32f053ca1945f53ee2538b153
font_01_sfnt_off000104f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F3 10732 bytes
SHA-256: 141c9974ce382fe6c37fb09750553d2225412cc4982f6a5601b0808c32898670