Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5db6fe7d69308e8…

MALICIOUS

PDF

85.5 KB Created: 2020-12-27 02:58:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9def745978428baf2bed2cfd95166472 SHA-1: aba99b4b2344f44f38bd316a0c975dcf3c1b27f9 SHA-256: c5db6fe7d69308e87ff24e625e2a6caeff64e42cd63a055da2353aff8663adae
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains text that may be intended to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/aws?utm_term=circuit+board+background+for+android In PDF document text
    • https://jezaxegare.weebly.com/uploads/1/3/1/3/131380636/1d35e64c7173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380080/normal_5f8a9ff5296c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470543/normal_5fb8adc0019f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384308/normal_5f8ce9f715087.pdfIn PDF document text
    • https://naluzamuro.weebly.com/uploads/1/3/4/5/134516405/5c926fe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450730/normal_5fb3699cd442a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487918/normal_5fc5c9581de7c.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/xeropizuwe/98804768635.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/3903678817.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/refivudomuj.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/83908961752.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/eastwood_mig_175_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/manorama_year_book_2019_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/45377752198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e1662d1-02cf-4322-ba74-c72f2d174eff/xonilurapil.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/44681863267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61a96a27-c236-4547-a92f-5e57fa210563/dafosipiga.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_off00011215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11215 5088 bytes
SHA-256: a3bacd9694efdc64cfb11ad404031dfa77d665c873801ff0f5e865a137984217
font_01_sfnt_off00012378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12378 11016 bytes
SHA-256: 9765a053239496ef9169e6bf7d9f7eb3888c4e30569dc55602b765f90f719333

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