Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79ad286803c78e0…

MALICIOUS

PDF

79.5 KB Created: 2021-05-02 20:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 086c94e7e00beb3d025902709d26e57f SHA-1: 27b72db36121540c39cb396191eedb2526e0312b SHA-256: b79ad286803c78e08cebaa4239e864d7b717e4e398687d4e65765e3bd2642229
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body appears to be obfuscated or corrupted, but the presence of URLs like 'https://crophysi.ru/strik?utm_term=food+product+recall+plan+template' confirms the redirection to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=food+product+recall+plan+template In PDF document text
    • http://cetapp.xyz/maze_runner_4k_downloadz8d3s.pdfIn PDF document text
    • http://amsidgi.xyz/76864427850z324h.pdfIn PDF document text
    • http://sport-stavki.fun/vulusokadosuxasrxmj.pdfIn PDF document text
    • http://qiwi-wallet.online/shotgun_sound_download_pubgb8ufd.pdfIn PDF document text
    • http://matcobzor.ru/5308339684023m5r.pdfIn PDF document text
    • http://mp4.design/how_to_drain_water_from_lg_top_load_automatic_washing_machinek164a.pdfIn PDF document text
    • http://werojati.getenjoyment.net/12080481451.pdfIn PDF document text
    • http://lorubuxetorifa.medianewsonline.com/kasolukemuxuga.pdfIn PDF document text
    • http://belldiscount.ru/gopro_4_silver_4kj3yhe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475874/normal_5fde2e4763a57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450260/normal_600b75463dc07.pdfIn PDF document text
    • http://nigemutekilum.mypressonline.com/free_printable_blank_bingo_cards_for_teachers.pdfIn PDF document text
    • http://bulubuzigajuzar.getenjoyment.net/diablo_2_cube_horadrim_runes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/how_to_earn_extra_credits_in_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/wikanirododeganoroxar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42caac8a-7dfe-43d7-a2bd-b2099f336bf9/12227669747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ecc2c66-e04f-45cb-9d4e-085c880ca3bf/how_to_write_a_critical_essay_introduction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f57f6a2-fcdd-4d81-8043-419a536b6e43/what_foods_are_good_for_gout_sufferers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3c24c64-77b4-4cff-9065-e2f62b867d4f/dumafag.pdfIn PDF document text
    • http://zizenatoxu.myartsonline.com/xawudixukerogemukedep.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_off0000f917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF917 4996 bytes
SHA-256: 84a92e1a6207fa23048ed5fca17f7ed8314a3e36a1fac5f017ba5c271fd38c14
font_01_sfnt_off00010a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A00 11380 bytes
SHA-256: 31a6a3999250fa6ea9fdf423b7e20cfe797d04ab145830b91806313b10a9ff5f

Open this report in the interactive analyzer, or submit your own file for analysis.