Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e7979765a9eb27…

MALICIOUS

PDF

114.5 KB Created: 2021-05-06 00:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4c475fa8c8277af4923c07a2dbe3cd19 SHA-1: 718c05739591c618ad3352b91b869bd96f974b5d SHA-256: 57e7979765a9eb279f51de68d86760f86355a4a8294433b97782e4357fe870a4
156 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 0.9996

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 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.
  • 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=attack+on+titan+season+4+episodes+total PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7395274e-a962-4376-84ad-21ba171c7ff7/xiwelabaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a132dc3-848f-4391-aec0-57e54b40e448/82506406999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5bc6370-ce4e-419c-bcea-ea350850f43f/59132362425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5bcb42f-e2ba-4c61-a1b8-df92aef99856/marta_bus_map_87.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e37b49-d37c-4705-b7ef-ff2a1a2e2f50/42577455634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2d469c0-c260-4a77-8b02-f93e7698a194/jamaxedobigotokogibamev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfb37e02-e084-433b-b838-53084ea143ca/30805835794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/490d18f0-db6e-40bd-b94f-6b9dc6406217/statistical_reasoning_for_everyday_life_3rd_edition.pdfIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_9ee8664d1ef04d76af9e15256f0a5266.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/281b9074-e866-43b1-90b2-93f8cda39f9a/daisy_powerline_1200_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5c7dcd4-137a-4dd7-9ea0-221a294647b1/84941304494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58622d53-fb64-45cb-9c84-82684c93b502/95351609055.pdfIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_6c478b53e0164693a565d39e175876ad.pdf?index=trueIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_bf60336bfc30417daf1809d68234d055.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fc64b50-23a8-40a2-99c4-07a8d6c4aa6e/71978550560.pdfIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_bcdbd1b760674d22aa86fca15aaf7e66.pdf?index=trueIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_56fc569819794f99a3c6cb22a391e1a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3d0972f-35b1-43c3-b7bc-073a4f1de086/gapijoxuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2755da25-66f6-4ce3-8967-a23ec99a47b6/diploma_mechanical_engineering_jobs_in_bangalore_cnc.pdfIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_a7f0611c90eb47a29410659a6782c586.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f10a4bd3-d0f9-433c-92ed-5d33383026a6/2000_honda_civic_repair_manual_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/716cf512-ac11-44fe-9a78-cad6dce8f2e3/pugunikomuba.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F81 30900 bytes
SHA-256: c5eb1557c1b2d89c6d09600abf00b9591d5a7d0d26247330af727de405d3e849
font_01_sfnt_off00018064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18064 5112 bytes
SHA-256: 18b041d6cb6bf67ffbdbffde3ced1acebdb01f0fdb9b72272549f04f2f9b65d7
font_02_sfnt_off000191ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191EA 13132 bytes
SHA-256: cb1e48540d2d7bc7b0b4bd6930bf3017cb365b6ed923fc2a8d77ce5770b89993