Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b915e945987a29b…

MALICIOUS

PDF

98.0 KB Created: 2021-06-12 06:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4489f0a279220d19ab80296516d9322d SHA-1: 663cf421dc3c345190b2045be306589cafbaa913 SHA-256: 8b915e945987a29b5f9e0a3e6a70009dd80bb165fbcc12f11adb4ca80c9d6476
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and a potential phishing or malware distribution vehicle. It contains numerous external URLs, many hosted on disposable domains, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://drafthe.ru/pbw?utm_term=kandha+sasti+kavasam+ms+subbulakshmi PDF link annotation
    • https://zojevobe.weebly.com/uploads/1/3/1/1/131163992/7a2e6cf55631.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452595/normal_5ff0a551556f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414164/normal_604378b45225d.pdfIn PDF document text
    • https://tozuriko.weebly.com/uploads/1/3/1/4/131437247/7119121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417220/normal_601b9c26308fd.pdfIn PDF document text
    • https://lijipipixeralof.weebly.com/uploads/1/3/3/9/133999964/botepo_jozejiv.pdfIn PDF document text
    • https://judurufag.weebly.com/uploads/1/3/4/6/134688768/35c59624f63c5.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/lesuxetizejagat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465555/normal_5fc950f783ed5.pdfIn PDF document text
    • https://tasekesin.weebly.com/uploads/1/3/2/6/132695719/gizavad_mivukopifudix_bijasoxubusidor_solefoteme.pdfIn PDF document text
    • https://zaxifugerabapaz.weebly.com/uploads/1/3/1/0/131071175/f39790.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7ecd206-8cab-4aeb-af04-259248ed9081/85805545360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddf37b65-5b43-467e-adef-3df6c58d031e/what_is_the_average_cost_to_install_a_generac_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4e17762-3738-45fc-989f-b5f49412d013/how_to_get_one_block_skyblock_on_minecraft_pe_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16f104d7-b66f-4009-8b87-be2ec039a45b/down_the_rabbit_hole_vr_lunchtime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd8b902-df8b-47e1-8c3a-c67d023ef721/little_shop_of_horrors_cast_broadway_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/896a504b-5bdd-4d97-8864-ca05cc4c6f89/79021217058.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc5beb8-f8eb-4674-a691-9d2d47e567af/gunalalanuxanulomegovuge.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 5200 bytes
SHA-256: f03f52b0807245be1af11165ee93ef19b34084199eca1467ca6234be3fa1e9fa
font_01_sfnt_off000113df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DF 8880 bytes
SHA-256: f03d77126089844d33e81d45bfc87e4c06167d44ab15dddec82a051212a924f1
font_02_sfnt_off00012caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAF 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_03_sfnt_off0001353c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353C 10856 bytes
SHA-256: 755bbbaa5aacab13edfa66fcb0e12100a57c7150b708c3e2f1e7f494f741510a
font_04_sfnt_off00015a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A77 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf
font_05_sfnt_off00016fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FB4 2300 bytes
SHA-256: 1d9aa17b88980ae27bee24214d47794f53c46f7a7392bb0274e206a084e17315

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