Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4ff2c12c366bcc…

MALICIOUS

PDF

83.4 KB Created: 2021-05-11 07:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b40b40a44eabecfd6e9618d0c3015637 SHA-1: 542ff79325682dee9f8d1df518de5c133b948957 SHA-256: ab4ff2c12c366bcc71a207d22c3490b3b456d08f156ec0c8aeaf73cd8d790574
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/strik?utm_term=how+to+reset+keurig+2.0 PDF link annotation
    • https://kigadipokifexi.weebly.com/uploads/1/3/0/8/130813079/gapikafojodizadizok.pdfIn PDF document text
    • https://kitomejefu.weebly.com/uploads/1/3/4/1/134108571/dokomaj.pdfIn PDF document text
    • https://zokevuwokonumez.weebly.com/uploads/1/3/4/6/134682223/zuzafiwelijigas_zapevuvazogaro.pdfIn PDF document text
    • https://japilosibif.weebly.com/uploads/1/3/4/5/134578465/9608855.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://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_ee37399322ad4391b62080e41b49514f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/16038769906.pdfIn PDF document text
    • https://a4067306-84c0-45ce-9c36-3cbb795fcb37.filesusr.com/ugd/d5b970_f77889f490574af593c96d344530e544.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/suxewadapididolofasimudaj.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_413ef1483db446129d4e7959fbb8ebdd.pdf?index=trueIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_b85c2545b7084204a320bec4db810707.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6093f08-ea16-4a7e-859d-6c497718ec24/zafinuzu.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/introduction_to_marine_biogeochemistry_susan_libes.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/are_sea_ray_boats_good_quality.pdfIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_f97dfab4f968427585222b7542742372.pdf?index=trueIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_6ee8d5cb633a490c9c46c8265ee96419.pdf?index=trueIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_eaf88652b0e846699993f60dfc1a86b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c7c0f6-8db9-4340-8d7a-f33fe276df6f/44015224154.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/sevobopafenik.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_off0000fbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF5 4812 bytes
SHA-256: 381c513ccdc8347bd8b4b331c582bd4c6b908fff5a57f0e6c743e9f24fed59fb
font_01_sfnt_off00010c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8C 10756 bytes
SHA-256: 7789a8e112845225fd4287bdede22e7dce72bee38bd2bca164a28cc2279ae7b4
font_02_sfnt_off0001312a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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