Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fa462dd2fef644…

MALICIOUS

PDF

71.7 KB Created: 2021-03-28 20:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 53bbeb73907726e3a9ba7bccb995c6a2 SHA-1: 9574bba4f7113b6e3e199f4c2fa452ebefc38cb5 SHA-256: a0fa462dd2fef64440b9d5fbdda9ff29450f3d05f019b2bcb79f5ad29d54667e
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 0.9996

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=dymo+labelwriter+4xl+professional+label+maker PDF link annotation
    • https://bofopigefofimun.weebly.com/uploads/1/3/4/0/134016695/9263065.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462038/normal_5ff6370537b65.pdfIn PDF document text
    • http://tuwasukam.getenjoyment.net/leremoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458431/normal_5fe66bf63a37c.pdfIn PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/d77f57f2236c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390637/normal_604795de19c5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502567/normal_603c39fd25825.pdfIn PDF document text
    • http://rujisuki.mygamesonline.org/webebadi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/71b5c8fc-dd62-4b46-827e-518fcf3a1b21/56436194085.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d43d1d-2ede-45b6-95d9-b6da58831aa0/2011_nissan_altima_maintenance_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/boluxajupijikox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de665b0b-d9be-4d2f-bc13-fdeeb9e99ce3/how_to_adjust_radio_flyer_4_in_1_trike.pdfIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/aprendizaje_cooperativo_johnson_y_johnson.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/27033428716.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/antrag_auf_alg_2.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/coefficient_of_variation_calculation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9675e394-be47-4c58-89fe-8f41663f51b9/officejet_pro_8600_printer_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/tozezopelunufigunasat.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/read_180_real_book_stage_b.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/copper_mountain_co_snow_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/78228619921.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/game_android_offline_apk_no_data.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_off0000d726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD726 5600 bytes
SHA-256: aa5075905f09fe9cbc0777587c4f2c8064502e4f5332b9e93558621b47610fa7
font_01_sfnt_off0000ea4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 10964 bytes
SHA-256: 9b1eafed2a6b19912145f3cc1d62f396d21f777ecc301b074a44c345e3f1d72b

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