Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd83ee8b0f320f0…

MALICIOUS

PDF

90.8 KB Created: 2021-03-07 21:41:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eda2f215e1416db65cc529d1f5e1b840 SHA-1: 58c476837ff2032867a85710a95f634eee6204e6 SHA-256: 3cd83ee8b0f320f0b4d9fad681af32ef3694ec6a10bca5b2832b89b56c4f8122
186 Risk Score

Malware Insights

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

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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/strik?utm_term=thinkorswim+vs+td+ameritrade+mobile PDF link annotation
    • https://sexitikimuzulab.weebly.com/uploads/1/3/5/2/135296232/7593310.pdfIn PDF document text
    • https://cdn.sqhk.co/wetaxawirewu/wkhdpBe/39994369362.pdfIn PDF document text
    • https://cdn.sqhk.co/bafesugoguwi/jiy8ja3/xivunijogafejitegunadimag.pdfIn PDF document text
    • https://vebafuxitupum.weebly.com/uploads/1/3/4/8/134890404/dajilav.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/jiwes_sawavedo.pdfIn PDF document text
    • http://kixorita.22web.org/abc_phonic_sound_video.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/hfNMhcs/the_cw_app_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/qhihdie/ruzejukug.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/iSNLje1/amazing_thief_in_hollywood_full_movie_free.pdfIn PDF document text
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/tofowafal.pdfIn PDF document text
    • https://kowagazobavov.weebly.com/uploads/1/3/0/8/130874359/c7ca6.pdfIn PDF document text
    • https://manujemupofux.weebly.com/uploads/1/3/0/7/130738512/kivajafegazubozeni.pdfIn PDF document text
    • https://karifizamazo.weebly.com/uploads/1/3/1/3/131383674/2074581.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tepokubomime.rf.gd/64144896725.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/microsoft_word_2010_resume_templates_free_download.pdfIn PDF document text
    • http://winuzuvejifod.epizy.com/chrome_apk_from_google_play.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/50th_birthday_party_invite_templates_free.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_off00010f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 5156 bytes
SHA-256: d1f9d7ddc42f031c12733613ad6bc623cc798851520d3312dbe66b5b3cf0634c
font_01_sfnt_off00012075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12075 15028 bytes
SHA-256: 1abf5da79bf40b4b506835269fef2e277883b8358ba3d245adfc97e7e6f1214b
font_02_sfnt_off00014f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F92 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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