Malicious PDF — malware analysis report

Static analysis result for SHA-256 b400394f35ef10a0…

MALICIOUS

PDF

74.7 KB Created: 2021-06-14 17:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 42cac4ceb4fe245f21d4a79bb649f31b SHA-1: 862cf15ea2a3cda78d5e1f549382fda0ba1a762e SHA-256: b400394f35ef10a081af559b7ae1bac7fc87ee7c2bd297b44f6e6949e527cd9d
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 0.9992

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://oniceh.ru/pbw?utm_term=turbo+vpn+unlimited+free+vpn+apk+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449599/normal_5ff02c63001c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406169/normal_6064145598d2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459165/normal_6012a7906cc31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470835/normal_5fc9e9a699814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384026/normal_60c419413872c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a9f0821-c39d-4214-96e9-71c207a1a5e4/95480813615.pdfIn PDF document text
    • http://mifudatu.pbworks.com/f/wamedew.pdfIn PDF document text
    • http://zobafolu.pbworks.com/f/smartphone_lg_g7_thinq_64_gb_6.1_platinum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/142f25e2-b3b7-4581-a01e-f7f7adbe1825/miruziwobozamozugifoxi.pdfIn PDF document text
    • http://xiwitanul.pbworks.com/w/file/fetch/145149180/73479308457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab1e731f-20fe-4764-8ca1-319aeb677a38/67251118317.pdfIn PDF document text
    • http://puzavofan.pbworks.com/f/pixufasexugijovef.pdfIn PDF document text
    • http://vevokofeju.pbworks.com/w/file/fetch/145275555/88254825199.pdfIn PDF document text
    • http://jawegele.pbworks.com/w/file/fetch/145143024/download_game_age_of_empires_2_free_full_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c09a970-4f83-4bcb-9a6f-49a565adeaa1/37770864004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6278a03-d405-4987-8396-5ab4c9203b54/63542990081.pdfIn PDF document text
    • http://dejulagimu.pbworks.com/w/file/fetch/144664344/how_to_pair_xiaomi_fan_3_remote.pdfIn PDF document text
    • http://bukafag.pbworks.com/w/file/fetch/145129251/arihant_gk_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a1f435d-6f72-4442-aa03-feb4e3656260/sijote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d910c877-6564-46ed-9dfc-e1636098f4a6/how_to_apply_vinyl_to_wood.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fb6eaa9-daba-412b-9811-aa5c2c089de6/dell_optiplex_9020_sff_desktop_computer_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89e3a354-27bd-4248-bae9-fee153868aea/manhattan_prep_critical_reasoning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c608fc26-ec55-413f-9ccb-5faf7a64e1cc/cd_key_counter_strike_1.6_no_steam_numeros.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_off0000e344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 5312 bytes
SHA-256: 6ba943a3d7b5d824a1a62ae003f5918579f6ce9c8f2ac65b1569aab1640d4514
font_01_sfnt_off0000f550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 11008 bytes
SHA-256: b1637f1ed6ed85a9b846ae9f21cbcc46999c6493409c5b1be3e3cae48ad8b44c

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