Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f590fb5fe508dd1…

MALICIOUS

PDF

67.0 KB Created: 2021-03-23 19:10:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 56e18e23b6205df42836713d0e5e4cec SHA-1: 43eb09f1f484117648803f87c98edeff7d11565d SHA-256: 8f590fb5fe508dd1be9da0edcd2b948514a45218ff49e5418b0d776873cc58e1
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a redirector link and a PDF link farm, with numerous embedded URLs pointing to external sites. The primary malicious activity appears to be directing users to potentially harmful websites, 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://dafemum.ru/123?utm_term=handwriting+sheets+ks2+year+6 In PDF document text
    • https://cdn.sqhk.co/fotutubujuf/ypjc9hi/cartoon_funny_video.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420468/normal_5ff0ba1165d96.pdfIn PDF document text
    • https://cdn.sqhk.co/gowozepugax/xHdNfhc/craftsman_903_piece_tool_set_amazon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415740/normal_6039d24321f55.pdfIn PDF document text
    • https://punofusa.weebly.com/uploads/1/3/2/6/132695323/sinapuvedabomuv_lajazeludinazu_duwobuxalusex_pezonipifexepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375199/normal_602cf44358262.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_60468d1c4ad9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454436/normal_604d6ff1d5be8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452395/normal_5fc62ec56d0fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478716/normal_60434e3821ace.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484359/normal_6009e5a9a9692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421333/normal_60384485ccd0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379048/normal_600dd12bdeac2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407989/normal_603e90d2aefa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_604491d981f01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502493/normal_6036dd96690bd.pdfIn PDF document text
    • https://fezagigix.weebly.com/uploads/1/3/0/8/130813643/7397716.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ca83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA83 5560 bytes
SHA-256: 22b2153bbca86f37497cbae3496edf48db0e4ad581283a94ad31cbf4f6ab00a2
font_01_sfnt_off0000dd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7D 9860 bytes
SHA-256: 87c380771b8ec8f199a041771b84c852d4614f3883f9fbacae6af94254080909

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