Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0fdb133212e2c1…

MALICIOUS

PDF

78.2 KB Created: 2021-05-06 10:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bd079e4fb97ff717194f5a2eb69f728d SHA-1: 9d3ef1e45111f8c1610b43f60e3e03966667d1c2 SHA-256: 4f0fdb133212e2c1f97473e9fdb9ff130eab9e506f1fada04a490c983420992f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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
  • 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://pelibifir.ru/strik?utm_term=que+mide+el+monitor+de+signos+vitales PDF link annotation
    • http://parkji5x.xyz/vabiradoussj0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_602ec735125d0.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/xukijulujixobumys86y.pdfIn PDF document text
    • http://datingdate.site/89196130272b9vls.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393489/normal_60439d436941a.pdfIn PDF document text
    • http://ygrash.website/83515172ix2lc.pdfIn PDF document text
    • http://ryukzak.digital/56695892801oe06e.pdfIn PDF document text
    • http://apkweb.net/how_to_remove_delta_single_handle_shower_faucetk1xvn.pdfIn PDF document text
    • http://feelslike35.com/98843999873qlpnr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375197/normal_606b0a7341e70.pdfIn PDF document text
    • http://makedctl.site/eureka_enviro_steamer_pads_60675lpaum.pdfIn PDF document text
    • http://good-production18.site/plague_inc_parasite_mega_brutal_androide1a20.pdfIn PDF document text
    • http://springtea.space/denuvezobujg22x.pdfIn PDF document text
    • http://lestyprin.online/vuderugoyb9pt.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/702b73f7-df86-4e8d-9098-0a232119ae63/pukilawun.pdfIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_89c3d8dd6d064585a34285ae2925e01b.pdf?index=trueIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_0e87a0dfa40446e2ade7b2e8c6cd6989.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/990de9a5-1b38-4ea8-b6a7-76be2a742318/vivofibotodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b96abd3-befe-4378-b37c-b53d6b10d7b4/the_castle_kafka_themes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8857ea36-88ef-42c6-ac71-4629b155a716/12309768573.pdfIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_97b30691a800407a88f2b2fb87925244.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f32049d8-5154-453b-8eb2-df968ebedcf9/8956192061.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_off0000e60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60B 5148 bytes
SHA-256: 521b3f57322c34a724bc9133e69d7be3937febf2ef36c5d390e9fdfef24ce42c
font_01_sfnt_off0000f778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 11560 bytes
SHA-256: 7320ace2931ee96a604c1df3842594d2c99ec92039afc05c79848557ddc1a4ee
font_02_sfnt_off00011d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D67 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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