Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33fee6585eb433d…

MALICIOUS

PDF

85.2 KB Created: 2021-03-30 17:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 30cf149ac1d611ff8b1748125e02ca3f SHA-1: c81e53c9a99b64f579aeeb16dc5092031122caa4 SHA-256: b33fee6585eb433d9937fa872485ccf4925f8e922fb21cd251316f0d38d14191
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to what appears to be an SEO link farm designed to redirect users to malicious sites. The primary redirector URL is 'https://bologen.ru/strik?utm_term=ribhu+gita+sanskrit+pdf'. This pattern is indicative of a phishing or malware distribution scheme, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/strik?utm_term=ribhu+gita+sanskrit+pdf PDF link annotation
    • https://sorasewemo.weebly.com/uploads/1/3/4/3/134358680/waziritedaxija_pisubek_wukanu.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/hi1kL9P/free_business_plan_app_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/gidulikegel/hhboii7/cubamessenger_apk_para_iphone.pdfIn PDF document text
    • http://agent-ritual495.online/vezebiwumenaliwakefokuzujjhtv.pdfIn PDF document text
    • http://it50off.info/onmyoji_arena_discorduelxz.pdfIn PDF document text
    • https://cdn.sqhk.co/toliximozupa/R97jalb/good_night_kiss_images_free.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/hfcFiia/sirisujekilipidit.pdfIn PDF document text
    • http://msertis.xyz/papesgxvit.pdfIn PDF document text
    • http://reabook.online/buccal_mucoadhesive_drug_delivery_systemarr7s.pdfIn PDF document text
    • https://jesepivop.weebly.com/uploads/1/3/1/4/131483445/5185449.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://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/buranda_busway_station_platform_1.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/80914556359.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/diamond_shaped_gift_box_template_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/dreams_interpretation_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06a97db4-fc69-40cd-bd04-1bd6c1ed0e48/how_to_set_charter_remote_to_lg_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcad0760-1ef4-4464-878b-3257d4c28557/28054797723.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/053d2f79-9916-4f04-a701-a754aa5eaac1/propuesta_de_investigacion_cualitativa_ejemplo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b17476db-ccba-4b70-892d-28c38249c2d8/35145854049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c550fac-a6fb-415e-9e9d-081daf2fbde4/39002903260.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/gloomhaven_scenario_book_german.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 5136 bytes
SHA-256: e424e17eaa7d4bc6b13680ca646d8337af711de5fdab8d041a9fc667c93219b6
font_01_sfnt_off0001030b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 12076 bytes
SHA-256: 8bade339ec72873e857b37abd10b81bdfba36413724505c79f414811ce86525d
font_02_sfnt_off00012877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12877 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
font_03_sfnt_off00013676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13676 4296 bytes
SHA-256: 39f8ff0ec04cf5daefddb44c812be34bc6d7b01872c65a1dcd7d5e5b5937c982