Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc7881b4b903060…

MALICIOUS

PDF

83.5 KB Created: 2021-04-05 07:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 646cb19c58210a49cae9dbe2724023d3 SHA-1: 5644b400f868bc5edae59476563f7ea3324ebab3 SHA-256: 3dc7881b4b9030604d69d9df6e6249cbc63de06e1bb6286b0ade0a5e4e444062
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 0.9997

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://jacksth.ru/wix?keyword=minecraft+shed+roof PDF link annotation
    • https://rosififobagas.weebly.com/uploads/1/3/1/1/131164218/3009759.pdfIn PDF document text
    • http://pekefosijemibi.sportsontheweb.net/syllable_structure_of_english_language.pdfIn PDF document text
    • http://favarivizuna.medianewsonline.com/declaracion_de_basilea_1988.pdfIn PDF document text
    • https://pivamuwonojazop.weebly.com/uploads/1/3/0/9/130969183/f3724d238.pdfIn PDF document text
    • http://gigezojiradof.scienceontheweb.net/motorola_baby_monitor_mbp33xl_extra_camera.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416789/normal_60558bbd1d2a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368741/normal_5ff925561332e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487382/normal_60342e898b178.pdfIn PDF document text
    • http://saniwigudovo.scienceontheweb.net/kupomasarobokimosose.pdfIn PDF document text
    • http://sanelobazigi.medianewsonline.com/cfa_level_2_study_material_free_download.pdfIn PDF document text
    • http://dinewegivogofe.mygamesonline.org/spoken_english_grammar_book_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484805/normal_5fd61255b5a16.pdfIn PDF document text
    • http://fuxisileza.mywebcommunity.org/vocabulary_test_for_grade_3.pdfIn PDF document text
    • http://xofitazuregokud.mywebcommunity.org/life_cycle_of_hymenolepis_nana.pdfIn PDF document text
    • http://zosuwalerikare.getenjoyment.net/90254399125.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/pubasapirub.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/19060002997.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kejufunekopal.epizy.com/chyawanprash_full_video_song.pdfIn PDF document text
    • http://fivinilon.rf.gd/wupomagidagowuz.pdfIn PDF document text
    • http://niselasot.atwebpages.com/piano_music_theory_book.pdfIn PDF document text
    • http://pebomotixot.myartsonline.com/breakthrough_plus_3_download.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_off00010a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A67 5080 bytes
SHA-256: dbc8ed8a2f4f57969c456d942641b81be7a29a3f74ab9ff894514e657ff43e7c
font_01_sfnt_off00011bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 10980 bytes
SHA-256: d419b17589c6087a63d64b8af4eeae9d4e12696f8ee307c195d0c5b243b34be7

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