Malicious PDF — malware analysis report

Static analysis result for SHA-256 f784a1547d8ab20a…

MALICIOUS

PDF

72.0 KB Created: 2021-02-20 05:58:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 899db316cf7c3b3dbc9dd67643d5f5c8 SHA-1: 5dfd227740bd02b3ebf5537d0d3f1e8b21311172 SHA-256: f784a1547d8ab20a6599f7df00e5895cb4ce2368bf2115143d4d49111c947a87
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with at least one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to drive traffic to various sites. The ClamAV detection and ML classifier further support the malicious nature of this PDF, likely used as a lure for phishing or to distribute further malware.

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://crophysi.ru/strik?utm_term=predator+generator+won%2527t+stay+running In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384310/normal_6017e02b9149f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476601/normal_6019594e01ee3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479451/normal_5fffa29b5312d.pdfIn PDF document text
    • https://rilulozopofebu.weebly.com/uploads/1/3/1/4/131406258/1095303.pdfIn PDF document text
    • https://fijapirugonobi.weebly.com/uploads/1/3/4/3/134315317/zubopu.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/sqhachc/ketuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373768/normal_602796c214b15.pdfIn PDF document text
    • http://renosivegegev.iblogger.org/korean_alphabet_worksheet_free.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/Ahi6Phg/trek_total_launcher_theme_apk.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/bagisi/parts_of_a_flower_crossword_puzzle_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/75311544684.pdfIn PDF document text
    • http://gaxufaxurawago.epizy.com/91554428615.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/adenosis_de_mama.pdfIn PDF document text
    • http://fepujusarif.epizy.com/different_types_of_formal_letters.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/panoxanipilabuzebomevuw.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/93452504541.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_off0000de71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE71 5192 bytes
SHA-256: 90ee1636237b392ee7c2ec792b98d8ab4980b65d2178714364849633e0ad04c1
font_01_sfnt_off0000f042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF042 10080 bytes
SHA-256: 44a2e71ae2dca7af093d250242633f5079f7683ac2df579a38f706c3908ddfec

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