Malicious PDF — malware analysis report

Static analysis result for SHA-256 b123db16e0ab3c18…

MALICIOUS

PDF

69.6 KB Created: 2020-12-06 02:44:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a4734a9bf30b929bd8551a4cbd375af4 SHA-1: bce0251e6da19538453a66d58fcd5abdc8321b66 SHA-256: b123db16e0ab3c18b3210e1a7c7ab3da4480e14fb09a1bd079cf9ec2ad6266b9
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 0.9997

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://traffnew.ru/123?utm_term=android+studio+application+development+pdf PDF link annotation
    • https://wesojejupeledaw.weebly.com/uploads/1/3/4/4/134446418/8783876.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/bekabasuref-rexokaxu.pdfIn PDF document text
    • https://rixutabenenik.weebly.com/uploads/1/3/4/4/134498467/4589836.pdfIn PDF document text
    • https://dewejudinasul.weebly.com/uploads/1/3/4/7/134702466/5659898.pdfIn PDF document text
    • https://doxujivadew.weebly.com/uploads/1/3/4/8/134875716/9187020.pdfIn PDF document text
    • https://bexepusukanuv.weebly.com/uploads/1/3/4/7/134775428/5289121.pdfIn PDF document text
    • https://ratudagusamidux.weebly.com/uploads/1/3/4/6/134692006/gemetavo_wededuwuges.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/679b27e1-9e56-414e-b747-29f525451a6f/suwotetagikofepakizinito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/710d1fdf-1c65-49a6-857f-eee9cf18bfb5/i_saw_it_on_tv_store.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d3df0cd-137d-4f84-9128-4c4e18157447/64302892427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e71588a-7a15-4f2c-a11c-7a68e65a11d8/70601836523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b5abc88-6795-4a96-a3bd-fbd903ee5280/maths_suites_terminale_s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/241ae84d-f808-4048-8c67-a5508d221c35/xepimuseburek.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_off0000d0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E7 5352 bytes
SHA-256: a7cee693e77291d4592069b1b033e6e20c594663af4cb605d913fe9b65537937
font_01_sfnt_off0000e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 11260 bytes
SHA-256: 7f089969e5f34a0792996eed57f9c307b74a1bf21d1369e6ae06f988bc2cb7cc

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