Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a8b56e1684a533…

MALICIOUS

PDF

77.4 KB Created: 2021-03-09 02:51:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dcbaa1fa110fc41cf03af57717dca80b SHA-1: 476d33d1eba9f33852d345f3bb341306fa21fcbf SHA-256: 18a8b56e1684a533fdc53a34d15c2426d36d25f157982aac0b965df27656ee8e
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 0.9994

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/wix?keyword=manual+j+worksheet+calculator PDF link annotation
    • http://korecos.ru/cervical_rib_exerciseszlqlz.pdfIn PDF document text
    • http://nejupike.mygamesonline.org/reset_liftmaster_keypad_model_877max.pdfIn PDF document text
    • http://bit7.top/antigone_monologue_analysiszqq2j.pdfIn PDF document text
    • http://jevafurevozu.mygamesonline.org/bajujidubelubet.pdfIn PDF document text
    • http://gukivuzijisuva.getenjoyment.net/87785634879.pdfIn PDF document text
    • http://idealslimitalia-ufficiale.site/core_java_interview_questions_for_8_years_experience8viai.pdfIn PDF document text
    • https://cdn.sqhk.co/xogovofofi/WQVibku/76548781996.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/sims_4_patch_september_2020_broken_mods.pdfIn PDF document text
    • http://newyearshop.site/sunbeam_bread_maker_recipesmvjt5.pdfIn PDF document text
    • http://stav-games.ru/hd_streamz_apk_latest_versionrbw2g.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/3849255132.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/0Ghex1M/galaxy_invaders_alien_shooter_guide.pdfIn PDF document text
    • http://cardioactiveitalia.site/interview_questions_for_math_teachersvwco4.pdfIn PDF document text
    • https://cdn.sqhk.co/setawigiz/yhhJMWC/kawarenezipubin.pdfIn PDF document text
    • https://cdn.sqhk.co/tijovomiv/hjhnvY9/gedulobijasanenuwikez.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jivamubug/street_fighter_apk_obb_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/geometry_word_problems_worksheets_grade_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/523dd3ad-df44-4f80-b4e0-57c97361b62c/lixuvagotibopafilakad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18d5d4e8-4400-497c-a862-c0062595806a/movogunovi.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/45618492275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17a370e6-e4ed-48b2-82e9-24dbc9b8d691/8591037617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9091373e-83d4-45db-bf8c-a7855a1020e8/sifomasunajosewopujitib.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_off0000eb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB18 1684 bytes
SHA-256: 8b69ad8bf8706a8de8604f0485c67fb25a23b24d50174afbb8bbf061f3c53837
font_01_sfnt_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 5124 bytes
SHA-256: 9739196ba943989a960e6b98d99ac94bfc394c8d25440e3d22e7be3b11630e25
font_02_sfnt_off00010505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10505 10216 bytes
SHA-256: e99a6bab8ef42dacbc6058f3cc6b28056d6ef1d3fcc4e361e981247196dabb04

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