Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f720f4bdcf27e55…

MALICIOUS

PDF

77.2 KB Created: 2021-04-11 15:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: dab17e4bb2bd51f8a44c401da557825a SHA-1: c951eae86a62ce4e4660887dbefffdeb0330fd70 SHA-256: 1f720f4bdcf27e55c212ade33b583dcd3a6e8108f9cbf3c917655bc820db4722
126 Risk Score

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 0.9956

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://bologen.ru/strik?utm_term=what+time+period+does+the+renaissance+cover PDF link annotation
    • https://kibimibenafozo.weebly.com/uploads/1/3/5/9/135979164/3604420.pdfIn PDF document text
    • https://cdn.sqhk.co/kijowevo/Fnghohf/wijunafek.pdfIn PDF document text
    • https://kunudixi.weebly.com/uploads/1/3/4/6/134667289/eb507f2c2f23.pdfIn PDF document text
    • https://roderisagewap.weebly.com/uploads/1/3/4/5/134507489/lirat.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/cm9E9gb/crazy_zombie__v8_0_hacked.pdfIn PDF document text
    • https://daxexamuve.weebly.com/uploads/1/3/4/4/134446800/bufavagezewamu.pdfIn PDF document text
    • https://saniruguroxi.weebly.com/uploads/1/3/4/5/134585545/nuninaxupokefupo.pdfIn PDF document text
    • http://septiki-rf.website/rusk_deepshine_smooth_shampootqx7r.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://cdn.sqhk.co/naboxolat/hgIpZWD/hangouts_app_apk_free_download.pdfIn PDF document text
    • https://givunanisu.weebly.com/uploads/1/3/4/8/134848628/panifidazevab-tuvutaferare-vofokedup.pdfIn PDF document text
    • http://wbigs.space/whirlpool_washing_machine_parts_price_list_in_indiajuyet.pdfIn PDF document text
    • https://cdn.sqhk.co/vopunokapire/eRijfje/sufaketowupun.pdfIn PDF document text
    • https://senakubedezozi.weebly.com/uploads/1/3/1/6/131606366/masorim.pdfIn PDF document text
    • https://jizotigop.weebly.com/uploads/1/3/0/8/130874082/xoseg_sagizez.pdfIn PDF document text
    • https://puruvafapazono.weebly.com/uploads/1/3/0/8/130815059/netix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e312a14e-2d0b-46dd-8163-dfb51993d8e3/honda_gx390_service_interval.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/sieve_analysis_test_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/weighted_averages_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fdccc5d-bd26-4acd-9e50-f61a972c80e2/hp_photosmart_7525_ink_refill.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/how_to_ease_public_speaking_anxiety.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/papoligeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b1918ee-a1aa-42e5-868d-f5f068240033/mefepodopuse.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/calculus_problems_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae9c5742-d99d-463d-ba88-2c18522ad8b2/nipof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7805569-4440-4bd1-b9c1-8715a284aca4/focusrite_scarlett_18i8_monitor_output.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_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 5352 bytes
SHA-256: ad813bf31dff3216fdb4028061ad177e605ce66793c5c29cc747d2728bd84fde
font_01_sfnt_off00010235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10235 10288 bytes
SHA-256: 2183e6dc2324e96da181c21083bc4a7c7c78db83495cddb49f8b72ff27823b80