Malicious PDF — malware analysis report

Static analysis result for SHA-256 290bec2aa9284d1e…

MALICIOUS

PDF

78.1 KB Created: 2021-04-09 20:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 50d50f5d80a78f4ed0900834efc78999 SHA-1: ccc5c70600f000de43444fabcfcd732352567d62 SHA-256: 290bec2aa9284d1e75f22b9a1ece69eb397853bc9799af8bfafc97695233b678
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, and one specific URL is designed to appear as a lure for CPR certification. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://golowaki.ru/strik?utm_term=american+red+cross+cpr+certification+card PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501208/normal_6023c383435f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380867/normal_6038f0b6c62a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412568/normal_605706689ca5c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_b91bf3ef5ae54ba2abd643d042644e0e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0d301ee-08e4-4f25-91f4-4b0ad1689966/womaj.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/note_10_original_wallpaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8701ed99-1287-4a36-995c-88b86c7b988f/where_is_the_filter_on_my_maytag_quiet_series_300_dishwasher.pdfIn PDF document text
    • http://vebaxabono.epizy.com/english_speaking_course_free_download_in_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6efdd8a-c9bf-4ad4-926f-5229dd37fbb5/15309387936.pdfIn PDF document text
    • http://vodugesivizere.epizy.com/t_sql_programming_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/16569474386.pdfIn PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_de5aacf827ca4bd49d42661677b90004.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a19fb43-6250-4877-ae04-220f35e7279b/suwamejizubaxilutab.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/24497208265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6303d468-9f86-4fac-8ce5-64b35b74796d/tuxorov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6489536c-d531-4772-9ba4-fe195f828e3d/nevegerenezitot.pdfIn PDF document text
    • https://be1b941d-c88c-475c-9260-a39c9d088d9d.filesusr.com/ugd/5c562d_287f7a3110ed414faf197d351dd30df7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcc23447-2a18-47af-98cf-bd9a217709af/20940697873.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_off0000f243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 5260 bytes
SHA-256: 33896ee507850e124189e72748c21c20a6791dad5702cb4a9902b5ac5ca6d150
font_01_sfnt_off00010410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 11552 bytes
SHA-256: 645ae1526665461c210568f8668c47ca3cde80d2d6b9602cb2d607751a118432

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