Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d987aef0be8576d…

MALICIOUS

PDF

75.8 KB Created: 2021-04-01 14:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7ba99eafab159709f6046d4f14b5e405 SHA-1: 5a965239f4da5fb73eca41abdb816be0e592d8b9 SHA-256: 4d987aef0be8576defd7b0d7fd2c35c00ee893f00d21f1e9987792e90b655d3c
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/award?keyword=bible+nlt+pdf+free+download PDF link annotation
    • https://zirakamu.weebly.com/uploads/1/3/1/3/131398357/5192910.pdfIn PDF document text
    • http://shoppermarket.online/174072468361bkb7.pdfIn PDF document text
    • http://sunmarkt.ru/after_books_in_order_on_wattpadwe31n.pdfIn PDF document text
    • https://webemimerur.weebly.com/uploads/1/3/1/3/131380848/gopesikelazum-rofaboxore-pinodokujutip-rujoliworuxafo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414687/normal_60587d63f20c4.pdfIn PDF document text
    • http://pro-komp-master.website/355257000976mhc3.pdfIn PDF document text
    • https://fosevikotik.weebly.com/uploads/1/3/1/6/131637163/7134746.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420752/normal_5fd1574044072.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481409/normal_5ff2c079601f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497356/normal_605466dc76daa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381321/normal_602a0fed164c4.pdfIn PDF document text
    • https://duroxogudoli.weebly.com/uploads/1/3/4/3/134318703/6015319.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465398/normal_5ff651431c622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_6034dc67ce8cf.pdfIn PDF document text
    • https://datagoso.weebly.com/uploads/1/3/4/7/134718767/visukurob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_5fe6de4a2f05d.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/xupimaral/difference_between_air_fuel_ratio_sensor_and_oxygen_sensor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e61d9f8-9f12-4b02-891a-4b7207144651/sowan.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/54297143686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c7a0de1-0921-4e2b-8818-5fe4fbbf28a2/faliwiriwenuzasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae2477e6-17fa-42ba-a245-f022318dfc94/blender_python_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/asgw_best_practice_guidelines_informed_consent.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/92050172060.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_off0000e985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE985 5140 bytes
SHA-256: c7b5b1962a48770a867e276f72bbfd8021c9b5b4b795d6a66dd0a5e98a52877d
font_01_sfnt_off0000fb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1E 11332 bytes
SHA-256: 9d7cf97b1d40a59dcf75044da26ec84bd0bebe3b610d0ed933412509dc558eb4

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