Malicious PDF — malware analysis report

Static analysis result for SHA-256 0485e994b6dd9b2e…

MALICIOUS

PDF

70.3 KB Created: 2021-01-09 12:48:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 10a44c52f99602ef29f7a41606befaf5 SHA-1: e924a46b07c05df8f3058357ca75f307a9284841 SHA-256: 0485e994b6dd9b2ef12662ea2decdff161e855dffce43a40b9d4f3fccdaad46f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a PDF link farm. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of malicious URLs suggests an attempt to redirect the user to a harmful site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=molar+mass+of+so2+o2 In PDF document text
    • https://gugekeki.weebly.com/uploads/1/3/4/3/134374678/9987337.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/hgjeugd/telivulivebomegakofuxak.pdfIn PDF document text
    • https://degezumibupupek.weebly.com/uploads/1/3/4/8/134862322/1a6f7a3dd.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/ripotot.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/gWicoif/hide_and_seek_lyrics_melanie_martinez.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/pegek/82004172769.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/petovipuvorumiraxijifud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c548d65-d4cc-46a5-bb13-964629d104ad/84418352765.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a4d2b6d-c042-4f20-864f-b97b8120ca65/oblivion_starting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/51513213917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4fa1832-c5e7-4152-a2f5-02e51f860a83/nio_world_jungle_adventure_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/49104447670.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/olympic_agenda_2020.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_off0000d3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E3 5048 bytes
SHA-256: 03dd38728261586ef800d648f902371ebf0aaecc0078b6e25a59efea4ff44d49
font_01_sfnt_off0000e501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE501 11692 bytes
SHA-256: ed30e62b1cc66e77e6ddc0c53d90341921967935ad0e1fdad393eaae308e71d1

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