Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5434e959edf045…

MALICIOUS

PDF

89.7 KB Created: 2021-05-29 12:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3a5488e3d5ed71c9a814c3dc79bf5929 SHA-1: ec196090b8626b568c29ad426c0a1256b28dc2ae SHA-256: 7d5434e959edf045480f56bbb476cab59a4a57a6806950b52a3b5fd908ce1bb5
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links pointing to various PDF files hosted on disposable domains, indicating a link farm designed to trick users into downloading content. The presence of a 'download button' heuristic and the ML classifier's high confidence score further support a malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • 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://baarspo.ru/strik?utm_term=coreldraw+2019+portable+kuyhaa PDF link annotation
    • https://sanufelileme.weebly.com/uploads/1/3/0/7/130775971/9089915.pdfIn PDF document text
    • https://vadenupajupav.weebly.com/uploads/1/3/4/3/134345777/3254744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381105/normal_600b1ff4b2e73.pdfIn PDF document text
    • https://fodolirikixubug.weebly.com/uploads/1/3/5/2/135297927/milopotamoj.pdfIn PDF document text
    • https://zixotojene.weebly.com/uploads/1/3/4/3/134315054/rabisolurorafep_fovewavuza_tewudexotimeze_zatagigofawu.pdfIn PDF document text
    • https://razosopowob.weebly.com/uploads/1/3/4/5/134509902/rofemuvexave_mixuzagawepa.pdfIn PDF document text
    • https://tedenugimug.weebly.com/uploads/1/3/4/3/134345185/nuziboladosebap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484812/normal_60312487d8e32.pdfIn PDF document text
    • https://xikosenazegan.weebly.com/uploads/1/3/0/7/130739601/085553.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380223/normal_606bd1f88c6ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426812/normal_6003f95609751.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448733/normal_5feeb873899d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476601/normal_5febc3c1c40c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_600db772712fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2875a55e-6205-4393-a1da-cfd19bca5889/388295198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c4f9cdd-39aa-4810-86e2-052ad229401a/mod_menu_mw3_xbox_360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e806c019-8c0f-4811-9b43-a35d81ef7a33/wafoviko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b0df9dd-175a-4d41-8c7b-78f41b74eb97/86809108176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/662aa740-ebc5-4509-99f6-d9cec510cca1/74603519523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9286a77a-5ec3-44e5-9fed-d691659d5956/what_is_the_difference_between_an_apple_and_an_orange_joke.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC1 3016 bytes
SHA-256: a57176794fb7a013e93cca151452ceab3ae41f145674f294752e3d0a0dd59424
font_01_sfnt_off0001057c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 5500 bytes
SHA-256: 573afa78718551d555079a0576ee8079321047d198c710075992f46a85d34c13
font_02_sfnt_off00011869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11869 22656 bytes
SHA-256: 954fc10b826a6ca9952a471b645886956746103119b9b40d1df9de4389e16e01
font_03_sfnt_off00014a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A93 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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