Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec31d1900ac78fb2…

MALICIOUS

PDF

87.6 KB Created: 2021-03-29 06:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e019af8c89a2d8d75bbbe9c4278d09a2 SHA-1: 894e80b7a9b0db27b658a21e6eee8c21020409d3 SHA-256: ec31d1900ac78fb24b097fc7e09ca1b749a13588516edd9ca7a07efe535f7cbc
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 0.9998

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=chemical+energy+and+atp+worksheet+4.1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449776/normal_602e1d52bd8e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426090/normal_602e09f32f76f.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/bRftifB/ninja_dash_run_mod_apk_android_1.pdfIn PDF document text
    • http://goodsun.space/siwosubobipizuviwjk8he.pdfIn PDF document text
    • http://idealica-it.website/kicker_kq5_manual70r96.pdfIn PDF document text
    • https://cdn.sqhk.co/xudevekelefe/hmmgc6p/95373783680.pdfIn PDF document text
    • http://istlan.space/what_is_dual_sports_examplefosr8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490371/normal_604dec49b721e.pdfIn PDF document text
    • https://cdn.sqhk.co/xumelesep/gjAjegi/car_simulator_2016_download_uptodown.pdfIn PDF document text
    • http://meriline.store/42715800779mhm7j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367923/normal_603c6b3820d24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391899/normal_60304b21dad46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463262/normal_600a94f1161cb.pdfIn PDF document text
    • https://cdn.sqhk.co/gukovafax/uCjhQkP/98617155274.pdfIn PDF document text
    • http://taher-tcac.com/aube_timer_ti040_manual36t49.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/somisilegex/89364112239.pdfIn PDF document text
    • http://fugedofa.epizy.com/lezador.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/51820868526.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/rotawevobumavabitasojip.pdfIn PDF document text
    • http://fewuzefar.rf.gd/bekigugefejijegizivopad.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_off00011533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11533 5820 bytes
SHA-256: 780554ed0350bc0739ca8a7e9ed16ba586b80c4891ef464d03db73765d7c4923
font_01_sfnt_off000128fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FC 11752 bytes
SHA-256: 82d5aa1d32c8730711ac91d0a7d55b7218137a71590b6f8ff6a24ead5da1cebc

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