Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7952d05e2e9b2c…

MALICIOUS

PDF

122.4 KB Created: 2021-06-05 22:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fb2fb549fa72899aeeeda044c67132db SHA-1: 4b704fd4912092e817ad85aec9f5d0448fd8d63a SHA-256: 4a7952d05e2e9b2c6ce163e1eb96b711b362dc5c83c0f5bfcce19b01465701db
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 0.9999

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 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://pelibifir.ru/123?utm_term=the+guardian+university+guide+2018+dentistry PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469638/normal_5feafa4359542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494866/normal_60bb1d794c2e8.pdfIn PDF document text
    • https://sufewusog.weebly.com/uploads/1/3/4/6/134644796/a3d5c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482012/normal_6034c1119e5c4.pdfIn PDF document text
    • https://rulodewarozuw.weebly.com/uploads/1/3/4/6/134678260/bc7b99380.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gazumadu.pbworks.com/f/what_is_a_preferred_supplier_list.pdfIn PDF document text
    • http://dimutojopog.pbworks.com/w/file/fetch/144599601/risuwozojejurewerarebul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d283627-5e16-455b-95d0-67e63679d9e3/80083740632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6e3428f-bab0-443f-bc56-902bf9a6f50e/10202890490.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e41acdf0-080e-4450-b60e-3457fa801158/83140459404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8143b61f-bd88-4708-943a-897d37e80140/techno_pave_touch_screen_watch_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a26623b-1949-4479-8cc7-14977137cdae/60747536877.pdfIn PDF document text
    • http://lebunurivugu.pbworks.com/w/file/fetch/144642318/free_download_video_background_changer_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/477ead8f-9206-4d1d-9861-5576fff3c857/digelegetogifexuzifuzili.pdfIn PDF document text
    • http://paditoxef.pbworks.com/f/butterfly_effect_2_movie_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a49187e-2d3f-46c3-9a47-a7fdcf8695c8/32855172363.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_off00019fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FB0 5688 bytes
SHA-256: ee86b99cc1fecfaad8c8a614120d64ee832671777d231ff2cfe522d952972e2e
font_01_sfnt_off0001b315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B315 12388 bytes
SHA-256: 00c9dd1ae606ccf3c30db6687c25858afd119e9188348e6d22439e8a646e8b36

Open this report in the interactive analyzer, or submit your own file for analysis.