Malicious PDF — malware analysis report

Static analysis result for SHA-256 33bfccf7c11ab689…

MALICIOUS

PDF

111.3 KB Created: 2021-05-16 15:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 57c4d729255b497518b8d52eafe78d1f SHA-1: aca6aeaa78adf28aa5b4bb95cdc4b5a418dd488c SHA-256: 33bfccf7c11ab6896f66f31fede770e66a0bd5f1aa32aaa7b05fe1ff3c85b3a3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • 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://druttle.ru/strik?utm_term=saeco+odea+giro+manual+english PDF link annotation
    • https://cdn.sqhk.co/bexefoboxevi/jbWAig0/caponata_ricetta_bimby_tm5.pdfIn PDF document text
    • https://zimipiboneletun.weebly.com/uploads/1/3/4/8/134894964/23d6a5eee18697c.pdfIn PDF document text
    • https://cdn.sqhk.co/muzedikerum/jeWyGAn/dwell_and_slumber_dupe.pdfIn PDF document text
    • https://vavetupabon.weebly.com/uploads/1/3/3/9/133999816/8d5571b3dc7d.pdfIn PDF document text
    • https://wigimosasalak.weebly.com/uploads/1/3/2/8/132814057/goduw.pdfIn PDF document text
    • http://goleludupa.iblogger.org/cracking_the_coding_interview_189_programming_questions_and_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/kenujowemi/gDMchgi/69080036946.pdfIn PDF document text
    • https://dururamud.weebly.com/uploads/1/3/4/8/134846475/mokuzorotukutur-pesoletonodex.pdfIn PDF document text
    • https://cdn.sqhk.co/pasededi/k6E8heN/extreme_car_simulator_2016_android_oyun.pdfIn PDF document text
    • https://judavolegarar.weebly.com/uploads/1/3/1/8/131871921/6621268.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/wulagisi/20913516496.pdfIn PDF document text
    • http://pukevekoba.rf.gd/coolrom_dolphin_android.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/adventures_in_babysitting_2016_free.pdfIn PDF document text
    • http://kenalukebuv.epizy.com/area_and_perimeter_of_regular_polygons_worksheet.pdfIn PDF document text
    • http://zikukoji.epizy.com/30280314759.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/haynes_manual_online_coupon_code.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/burns_ppt_free.pdfIn PDF document text
    • https://f3dc8d0a-397f-4303-99a5-a7927e83d850.filesusr.com/ugd/e916cf_4d11bed7e8844d728eecf3b2e4c26ca2.pdf?index=trueIn PDF document text
    • http://nidawijonag.rf.gd/karcher_power_washer_1800_psi_1.2_gpm.pdfIn PDF document text
    • https://849cba27-c1c2-4801-a47f-514a08c45c3c.filesusr.com/ugd/7f7a2c_0d259c3ab9cc429f87da10083673d7c6.pdf?index=trueIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_a02cc94b05924e8a9ed0a15198386976.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/9882766840.pdfIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_0deac19619b442a680c7f2c77fe78ddd.pdf?index=trueIn PDF document text
    • https://17c3d818-7f64-4152-976a-2fa997d7a7be.filesusr.com/ugd/e2c250_d7b9480c41f8414eb93247179cda08ed.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17449 5456 bytes
SHA-256: 5feabceaa5859389628f29f9fa2d9b905a6a390983a32c8302775f018798d4f9
font_01_sfnt_off000186a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186A5 12160 bytes
SHA-256: efaaae7036582541bc694e9d3e15db2900ab635584a7e3696eded680cb0f751c