Malicious PDF — malware analysis report

Static analysis result for SHA-256 c624f81e00093fef…

MALICIOUS

PDF

84.3 KB Created: 2021-03-31 01:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 54771fee4f84999d74ae71f7b813bce3 SHA-1: b6c8d60513ce55a78feae717628b826c57cbd79e SHA-256: c624f81e00093fefa5bf8ce2ac54cfeb1f95dda65ca3694b45894dbe7c18d20e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=afl+live+2+free PDF link annotation
    • https://cdn.sqhk.co/tumowara/ggdjbii/my_pcc_account.pdfIn PDF document text
    • https://cdn.sqhk.co/denirinodo/ibwsifz/rugby_league_finals_2020_draw.pdfIn PDF document text
    • https://cdn.sqhk.co/mesodimeduje/0Chagh4/7_minute_vocal_warm_up_pro.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/c5fd47d1-a619-4384-9b1b-930679345fff/ponniyin_selvan_english_part_2.pdfIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_71d9a51ffa6d42fc818cd415b2600716.pdf?index=trueIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_ffdaa047802943d089de5f46aeff01d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9becb0f5-4a0b-480b-b2a6-237d96932b66/xuzuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80ae3ef0-a73d-4fe4-a8f3-bb02507a6116/hp_photosmart_c3180_check_print_cartridge_light_flashing.pdfIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_db8c818ba7034128b87569dd0be68dd9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/27b0aaa2-29ed-4a8f-b8fc-306a27ea6135/moposuxexovifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe1736c3-c518-4450-b52d-533bddf2965b/what_is_the_chemical_composition_of_motor_oil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d167bcd-8f9f-45f9-ab44-f8e304ce6b9b/93134098678.pdfIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_cd74451053794717858a53fddfc7790e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d18beea5-915d-485b-90e4-721d9dbf7d6a/how_to_write_better_essays_in_college.pdfIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_d6bf57e23af14594a6a4f99b96219500.pdf?index=trueIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_0b9aa0de6bde4c15b277c6123a89bcef.pdf?index=trueIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_a2d6c3e6a81d46909f40769c99b6d390.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2146f94d-fb2a-4bcf-8a46-05b0a88c1ee5/animal_farm_chapter_3-6_summary.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_ab97b0832b084594993d2e3de5cf01e2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 4048 bytes
SHA-256: ea3b48790a3bf1b0a6a1c99515667822f0436f38e420c6864647fe4809439d82
font_01_sfnt_off000110b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B4 10720 bytes
SHA-256: 2d8fdaa1009f4a213e084dc26e082b0f0f39888ecb708605219bd8aefa34e952
font_02_sfnt_off0001357c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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