Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff77a9acd7f886f…

MALICIOUS

PDF

140.0 KB Created: 2021-03-17 03:27:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 40df0d99b4c80ff8b9ad11ae9452c6ca SHA-1: 2d7ecc75d3d3060f3dd31bede28c684257365587 SHA-256: eff77a9acd7f886f473cd0c17e928fc58796267f4f032ac5bd841e8413d7c989
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to unknown or suspicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document is a link farm on disposable hosting, reinforcing the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://mezovuduw.ru/123?utm_term=castlevania+order+of+ecclesia+glyph+guide PDF link annotation
    • http://cybety.xyz/barbados_passport_forms_b2jrmm.pdfIn PDF document text
    • http://merovew.xyz/fugarosogizinazwkroy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467030/normal_5fe0310f96286.pdfIn PDF document text
    • http://reawolt.online/nimamufediteloqoeq0.pdfIn PDF document text
    • http://rrrrkkkkk.space/56092339550hu6w6.pdfIn PDF document text
    • http://bnatural.space/4_pics_1_word_level_2604r1s8c.pdfIn PDF document text
    • http://biomanix.best/what_happens_at_the_end_of_doctor_sleep_bookmki0t.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/4f34ec77-fc6e-48ed-af07-5dccabb83232/armstrong_air_ultra_80_oil_furnace_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/936acc47-7a58-4148-9276-b10bb4ef4f46/wendys_salad_nutrition_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/fukibetoxafep.pdfIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_8f32e15a514d4e988124273a665db407.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/tekoritexofuvet.pdfIn PDF document text
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_47b43b08f3784a6481c7ecb611ababfb.pdf?index=trueIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_91fa4716c234411582e31772b609e880.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/vorukavaga.pdfIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_ec001a228b0c46a597104b43db595333.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f725bc-6f04-4a79-aace-d5014a76844c/pdf_free_printable_hatha_yoga_poses_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8465700d-9709-4556-9e9e-8f1da966469a/divina_commedia_canto_13_riassunto.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_off0001d97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D97D 5484 bytes
SHA-256: 8b35011dfb8934b2900d381d2c94650ec535f205af73df48a072421c33daad26
font_01_sfnt_off0001ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC28 11824 bytes
SHA-256: 109d2d83efd0d856c2c3d8b52f70c25463c6b913b41cc42c2a57de7a6743a6fc
font_02_sfnt_off000213ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x213BA 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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