Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8089da5e09037dc…

MALICIOUS

PDF

69.4 KB Created: 2021-03-23 02:15:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fdd91eebbf26bb93d3720f2f6ac68adf SHA-1: 97e5a6be84a1bb1ccff3812457bd570d09a82eba SHA-256: b8089da5e09037dc7d4b805f8de38911ad08813122da57bd595bad7eb70b8529
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 0.9995

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://jacksth.ru/strik?utm_term=in+the+realms+of+the+unreal+trailer PDF link annotation
    • https://cdn.sqhk.co/mijajijem/gdictGs/jurefutifemerul.pdfIn PDF document text
    • https://cdn.sqhk.co/nisifowisom/jcE8sgj/52929187248.pdfIn PDF document text
    • https://vixikubinimagap.weebly.com/uploads/1/3/3/9/133997110/fepowud-kuganedolutefiz-nugedevaz-bawevufezo.pdfIn PDF document text
    • https://cdn.sqhk.co/fixeruzef/ichczKG/factor_and_multiples_worksheets_for_grade_4.pdfIn PDF document text
    • https://cdn.sqhk.co/lasanamemego/EjjpDgd/islands_in_the_stream_original_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/vadavenaw/hdfGm8G/fifuzalatubawaw.pdfIn PDF document text
    • https://gibitomenufe.weebly.com/uploads/1/3/4/0/134041720/xabej-matoset-jetaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460466/normal_600f5ce9e11dc.pdfIn PDF document text
    • https://xapewagese.weebly.com/uploads/1/3/4/3/134314981/litadakisowafu.pdfIn PDF document text
    • http://vufakitupo.22web.org/best_stock_for_new_investors_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446789/normal_5ff99126c658f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478438/normal_60368444ee735.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/71dcd699-cecb-437d-bc45-acefe1cb50b9/xupevukosolane.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/lungs_function_test_report.pdfIn PDF document text
    • http://varosuvavim.epizy.com/speaking_ielts.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/tujifopefomivosimavidoxat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e89dd82-980b-4daa-9fd6-75b308fef4dd/holy_bible_english_standard_version_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/pipijukitemefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7580a0b1-a24e-4380-b9c7-65e95681309a/vizio_vo320e_replacement_stand.pdfIn PDF document text
    • http://rawodofomer.epizy.com/php_5.1_for_beginners_free_download.pdfIn PDF document text
    • http://mulupopanedisip.rf.gd/mini_gps_tracking_device_bracelet.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_off0000d32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32F 4944 bytes
SHA-256: 222a92ad59d5ad252387f096fed4ac8093f16f322d70d6e8f9a0165ae44f0e51
font_01_sfnt_off0000e3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 10640 bytes
SHA-256: 51c3d1d0081b640bcf323fd3c6089fdfed922745ef572b5f725d2bd2627ad907