Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2d67b65967271d…

MALICIOUS

PDF

77.4 KB Created: 2021-03-17 18:01:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6bae99f4e68657c2d81224d1a968bbf2 SHA-1: c5b364a2e100c59be3c323ae6fc04fa3d6f974ea SHA-256: 8a2d67b65967271d39eab3694f668f615e82387eeeb925f0a8664cb2e4a1d1e3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to external domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting an attempt to distribute malicious content or phish users. While no scripts were directly extracted, the presence of external URIs and the ML classifier's high confidence score indicate a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/wix?keyword=cheapcast+apk+2018 PDF link annotation
    • http://zaxevef.getenjoyment.net/39750372375.pdfIn PDF document text
    • http://kobazugipodiv.medianewsonline.com/zajobopererosejezax.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/jumping_the_broom_2.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/61240626401.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465025/normal_5fc59f627b7c6.pdfIn PDF document text
    • http://bobujopolodusol.mygamesonline.org/crpc_bare_act_book.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/lenovo_t430_display_drivers_for_windows_10_64_bit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501789/normal_5fd9135e9f6ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410418/normal_5fcaa77d18831.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460694/normal_5ffa6c70bb6e6.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/62175341867.pdfIn PDF document text
    • http://fibaxoxadomi.sportsontheweb.net/balanitis_circinada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/how_do_i_log_into_my_motorola_router.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6f9062a-5fee-490a-9628-9caa613cd065/walmart_photo_blanket_low_resolution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd13570c-e17f-4ccf-843f-b83a7134f139/93932989268.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/3rd_grade_math_test.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/xarurimuzasuluna.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/92058824346.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/letter_writing_template_tes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/414923c6-b4dc-4430-975c-471dbe7ca1ce/vonidot.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/blazing_bull_sekiro_guide.pdfIn PDF document text
    • http://ranitirunom.myartsonline.com/lord_of_the_rings_piano_guys_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/61624039493.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_off0000f17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 5380 bytes
SHA-256: fd199881bc80a25dbedc0fd62b93894aa2c2b10752ea826288f8a91091895b12
font_01_sfnt_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 10688 bytes
SHA-256: b7f05aa79c3a23cd884825f963db0ee3671eca7b4b279a7ea1e13f01ca857652

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