Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff4aa4bfb52237b…

MALICIOUS

PDF

74.7 KB Created: 2021-03-22 18:52:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 435783aa43e6311ac8b0faa3720088b3 SHA-1: 736081bd2074ab0d687c78d0fb2e9f7a577b3dfa SHA-256: 8ff4aa4bfb52237b94bb8aaf762e9156f2bc3b4df87a36c4b34fac8ab91db6e9
186 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 0.9998

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://jottigo.ru/123?utm_term=kid+screaming+meme PDF link annotation
    • https://cdn.sqhk.co/pujixefan/iaKhiiP/picshop_photo_editor_pic_collage_maker.pdfIn PDF document text
    • https://pulosonimoge.weebly.com/uploads/1/3/0/7/130739093/vudito.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_6031d85c8044b.pdfIn PDF document text
    • https://rigegafotu.weebly.com/uploads/1/3/0/7/130740045/zakejimotatuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426063/normal_5fd917c7e1818.pdfIn PDF document text
    • http://penageli.getenjoyment.net/types_of_market_segmentation_with_examples.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488815/normal_60403cb382681.pdfIn PDF document text
    • http://gigezesuzobe.getenjoyment.net/what_does_flashing_green_light_on_battery_tender_mean.pdfIn PDF document text
    • https://cdn.sqhk.co/vavetiset/jfGjbin/zonijufafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383678/normal_601b120f9512f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385415/normal_5ff0b076c0b34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477649/normal_5fc81bb05cffa.pdfIn PDF document text
    • https://lexugorubu.weebly.com/uploads/1/3/0/7/130776619/3722857.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/what_happens_if_you_dont_have_a_dot_medical_card.pdfIn PDF document text
    • https://cdn.sqhk.co/pelemobi/XjeifaR/wibolo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://temolujipu.myartsonline.com/vurabasogexojekiwetuzefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/489e443c-36de-49c2-9aa7-b03f6338862c/mujavukimexevip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a91c5cc2-0f40-4c27-a069-87398a0d7a0f/gafokamasafasuwiwotedus.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD9 5196 bytes
SHA-256: f58416f8b873e70c04bc2b7b055c402c4f729b0427935f18f9c7268ab8a6a38b
font_01_sfnt_off0000e171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 10908 bytes
SHA-256: 4994f193cde2345819a6bf7270aa5238fe56978b5fb779f9c6f178ed24654552
font_02_sfnt_off000106cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CB 16272 bytes
SHA-256: 36ed9caf719e0849df8fd87ade7d51f3d04b8af5454f1aaa896d38a56b473f78

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