Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4188f33de051ff…

MALICIOUS

PDF

64.4 KB Created: 2020-12-24 12:53:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 16123fb0f3a259ad7a331e928b77e3be SHA-1: 16d9e95109c5d112e61df547897c6dc030c29a3d SHA-256: 4c4188f33de051ff2d387e3c932f2f75b9c285f66ef1de946fd999a2c0d16aea
186 Risk Score

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://trafffi.ru/aws?utm_term=xiaomi+mi+a1+receive+android+10 PDF link annotation
    • https://korexabareruwa.weebly.com/uploads/1/3/2/6/132680962/pipigi_kebaposuxawabul_dinavuxuxadejez_pajoladod.pdfIn PDF document text
    • https://fopimakalegej.weebly.com/uploads/1/3/0/7/130738542/kitewek.pdfIn PDF document text
    • https://pixabetamomu.weebly.com/uploads/1/3/1/0/131070001/7468029.pdfIn PDF document text
    • https://cdn.sqhk.co/sejujona/jffhcgc/balenciaga_white_green_triple_s_sneakers.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/jinetavude-xosal-voxekedaxolenet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415767/normal_5fca2c26d4930.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/gadejuregidan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480145/normal_5fa939a5b63be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462732/normal_5fb73e1a500de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/23536360011.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/gupojamusizevupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b23bde-a2ab-49d9-aabc-c92a2c135de1/the_forgotten_500.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/monkey_dance_hillsong.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_off0000c086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC086 5108 bytes
SHA-256: 9306817946621eff72fd248b056308dbca0771b7add3ecda3ccedefb8c5c3ce2
font_01_sfnt_off0000d1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D4 10240 bytes
SHA-256: 176b8614181efeae95bb788b729f2080aeea23beebd60656399c9ecd0e2d4db9