Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc87b7e152083948…

MALICIOUS

PDF

79.6 KB Created: 2021-03-26 07:28:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 22ac6317f258e04abd987dd566b71adb SHA-1: 220739f122d7f820cdc9c6a6e7d4c54a49b5422c SHA-256: fc87b7e1520839486d9812601507cc7146952aa2a6c7c2c612825804329cd887
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a URL that appears to be part of a link farm designed to mimic search results for printer parts. This, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or scam campaign. No scripts were extracted, but the presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the primary attack vector is directing users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=hp+laserjet+1320+fuser+unit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452621/normal_6021ab50e48ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452377/normal_5fe7566e210a8.pdfIn PDF document text
    • https://rusapaja.weebly.com/uploads/1/3/4/6/134617617/wuxufupagesijutumoz.pdfIn PDF document text
    • https://pemejelusapi.weebly.com/uploads/1/3/1/3/131398576/1551920.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407724/normal_5fe0c9f4d6b18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415309/normal_601704c2e37a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/kabali_tamil_full_movie_free_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/the_first_90_days_learning_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/86539158104.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/99777862504.pdfIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_f858d52a3b7445ca8c5ba2cd392a155a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/xebusotero.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/bbmp_pid_no_format.pdfIn PDF document text
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_b6b4ff09d15f4278965f3b03752b2bdf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fizup/zavefunus.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/30316110906.pdfIn PDF document text
    • https://c482eaa1-e3aa-4fde-9473-53ba98cc9791.filesusr.com/ugd/94322e_afa6adb6b89e400a9a1b8290e95377ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/whats_the_best_jack_reacher_book.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/blessed_be_your_name_piano_sheet.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_off0000f958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 5420 bytes
SHA-256: 3ffacc7930364995894796297911108e590d359af26d74d43a4bc21a3c4f91ac
font_01_sfnt_off00010bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDA 11156 bytes
SHA-256: 28d32cc850e484f9f3ea5a71e83de902ba970169ebbaebc181ab5fc28fae9fb9

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