Malicious PDF — malware analysis report

Static analysis result for SHA-256 5516ddd7fdc7bad3…

MALICIOUS

PDF

81.2 KB Created: 2021-03-19 22:23:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0d77d4257e4fd8f40dcb1e624266adb0 SHA-1: 47bb30b79a7be71588114a002291953ec36fd2c8 SHA-256: 5516ddd7fdc7bad391d76075dae9821693d5286d2f4c30cc55efb83776582308
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a mass of external links, including one to 'baarspo.ru', suggesting it's part of a link farm or phishing campaign. The document's structure and embedded links point towards an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/wix?keyword=merge+k+sorted+lists+divide+and+conquer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412778/normal_602d84895c133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_604e399e4388d.pdfIn PDF document text
    • https://cdn.sqhk.co/jojevirelo/pjjeiad/my_airtel_tv_recharge.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/chirjif/sokagifizonepofuwetitok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426423/normal_603e6124cf719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427828/normal_5fe9156236f72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483836/normal_60068fb863214.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/aihcq2n/spider_bites_on_dogs_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/rotexopapi/Ehiiijh/best_spaceship_fighter_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390373/normal_600f75e197f23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468255/normal_5ffcae4b5def5.pdfIn PDF document text
    • https://cdn.sqhk.co/salenasova/hjviBjf/harvard_business_review_student_coursepack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_601bce1c37d97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385214/normal_6021f8fd74b23.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisedetu/jbjjjjl/53359100959.pdfIn PDF document text
    • https://cdn.sqhk.co/kekumumaxow/iPgfoWs/32770302098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485309/normal_6025c4d6cc0d9.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/uhjjbfT/recargas_claro_nicaragua_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_eb61cd50ed8e42ba94ee2e57be32d8a2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tarajix/question_answer_of_chapter_packing_class_9th.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/small_baby_boy_pics.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/56743224161.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_491810e735d84446a3995062cf7393ef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/videoshow_pro_gratis.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_off0000fdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD5 5364 bytes
SHA-256: 2c9f22851e5b02607b943628a2bb4f3e20bed8a2d57cfaaaf75f1e80fdbe030f
font_01_sfnt_off00011030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11030 11468 bytes
SHA-256: 4dc985acaba5c08c4016ab5813c323c8ffb6e623e0009285c851930359645c7d

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