Malicious PDF — malware analysis report

Static analysis result for SHA-256 879499ab190d21d9…

MALICIOUS

PDF

72.2 KB Created: 2021-03-05 03:45:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8f2385c1e735f751810fc8a819b9a8a7 SHA-1: 8d1083910669db7c2c647d8936de4576f6c05838 SHA-256: 879499ab190d21d9d23903b8d8bdf53e748cca078265c718f2ee9568e3cc3178
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and appears to be non-readable content, further suggesting a malicious payload.

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/wix?keyword=the+leukocyte+poem+answers In PDF document text
    • http://wgathering.org/cobra_walkie_talkies_microtalk_chargerb42g9.pdfIn PDF document text
    • http://usacarins.com/siamese_fighting_fish_care_guide8qduc.pdfIn PDF document text
    • http://amorexpo.com/semi_formal_wedding_dresses_plus_size5o6sk.pdfIn PDF document text
    • http://fakts.design/how_to_clean_a_farberware_coffee_potdrr1c.pdfIn PDF document text
    • http://micrometer25bill.site/how_to_apply_demi_permanent_colorzsjtk.pdfIn PDF document text
    • http://allostar.buzz/how_long_can_fleas_live_in_water33n58.pdfIn PDF document text
    • http://awpmode.com/vizio_29_inch_sound_bar_2.0_manual2r532.pdfIn PDF document text
    • http://naturalgood.space/76310168524l063w.pdfIn PDF document text
    • http://cashtanks.fun/antagonistas_adrenrgicos1vlde.pdfIn PDF document text
    • http://hermidkovo.info/the_misfit_of_demon_king_academy_wiki_avos28vwp.pdfIn PDF document text
    • http://gelchlen.fun/5923740922o1ewn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_1b90e6d65463467a8223886d59c58039.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dfd10a2-296c-4168-91f3-d418c895d4cb/triangle_offense_management_company.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d54fcbe-532d-4296-abc0-d7a3da388252/zelurovubu.pdfIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_1c7b0cd7d92e4f6790ae799776b5cb11.pdf?index=trueIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_29798a9fa6cc4e3782a510ced09a73da.pdf?index=trueIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_2799ac8220b548e88fffc3ea34b8c017.pdf?index=trueIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_754a75fca319493cb7cbb7af454d5449.pdf?index=trueIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_374685c9ae1c419e816d2e35b0af0ebd.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_off0000ddca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCA 5380 bytes
SHA-256: 9f4f52315aa6c5520b0ec3c785f4d53bb9dcfeb9659774b869f83ddadb001319
font_01_sfnt_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 10528 bytes
SHA-256: a15a1cec4f5758b6f86c9958c198fdeadb3ff90e8965045853a098640f50ce3a

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