Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b17aacd50b697e…

MALICIOUS

PDF

75.1 KB Created: 2021-03-27 10:55:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 72db8247aaeecf4a55e0ca4b67d2fee2 SHA-1: 75bb2891ab1c14e6639ab5a8acd80b72a652f7ce SHA-256: a4b17aacd50b697e8ee942ffb48e2322a482230f1c0a679f29acfdcface76230
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://xajibur.ru/123?utm_term=animated+background+wallpaper+free PDF link annotation
    • http://kolegutoravi.mygamesonline.org/jerumobuvodawebebimudet.pdfIn PDF document text
    • http://eeuuurrrrr.space/reconstruction_era_policies_timeline_worksheet_answers6vcbm.pdfIn PDF document text
    • http://italywow.space/woodworking_projects_that_sell_good81wpv.pdfIn PDF document text
    • http://nakanilo.club/jabodosevurapaabya0.pdfIn PDF document text
    • http://promooffer.site/gluten_free_dairy_free_snacks_ukonha1.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/vevatepobi.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/d1xgceK/1st_grade_math_worksheets_printables.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/ijhjagc/binilaxutoj.pdfIn PDF document text
    • http://fsbsiod.com/jakamigirojisukeboxeviw1sbav.pdfIn PDF document text
    • https://cdn.sqhk.co/toxaxiked/jgqMgcT/nelijenewalami.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/chemistry_formulas_in_tamil.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
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_d0dccd7d5ff7450588659bfb67de35cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dad2bbf5-3824-416a-b2ec-0dcd69b723f9/roman_numeral_worksheets_grade_2.pdfIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_907e3cba9d6d4b42941af09abed0636b.pdf?index=trueIn PDF document text
    • https://a3abd3d7-f7e4-4b0c-86b7-ec358d8c805a.filesusr.com/ugd/97a3b3_6254fdbeee384091bade9083e2076412.pdf?index=trueIn PDF document text
    • http://lolunoxij.myartsonline.com/annual_leave_letter.pdfIn PDF document text
    • http://witesenigo.atwebpages.com/wunawogobijamavupu.pdfIn PDF document text
    • http://kilarosine.atwebpages.com/41569405988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6e0b24-5fe3-4189-9b02-c81438071a78/how_to_make_fire_alarm_stop_beeping_low_battery.pdfIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_ab7fe6e2ee8045298e7c42421d8c05eb.pdf?index=trueIn 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_off0000dbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDB 5464 bytes
SHA-256: ccb1f559d9e12f4ea2ebee93973c410f43f966cbb221935f245c0307b64b7292
font_01_sfnt_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 10364 bytes
SHA-256: 28cffa5395dba5930e9ce981d4b610a2fd8420adcf4147630a2ba829b3e2f9b7
font_02_sfnt_off000111d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D6 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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