Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac46472f0431703…

MALICIOUS

PDF

64.5 KB Created: 2021-02-22 10:42:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 620ef0ab63267a7c844fb651401c78a3 SHA-1: b08c3777e6554062e6ad4e83b7a3b5c79465232b SHA-256: 0ac46472f0431703ffb744f8c48c969f42111a42fba18ca247b305e337c4d387
214 Risk Score

Malware Insights

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

The sample is a PDF containing numerous embedded URLs, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of many external links suggests an attempt to distribute further malicious content or phish users.

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://yafferge.ru/strik?utm_term=real+analysis+apostol+pdf+download In PDF document text
    • https://cdn.sqhk.co/genopeno/igchbMu/hungry_shark_evolution_mod_apk_hack_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/jfx0Wje/riverside_california_criminal_case_lookup.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/jhgjfje/cheats_for_minecraft_xbox_one_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/iGgeUYW/top_10_hits_of_the_70s.pdfIn PDF document text
    • https://cdn.sqhk.co/nemisova/zYZV3gj/72877759415.pdfIn PDF document text
    • https://fukenotaza.weebly.com/uploads/1/3/2/7/132740373/5c43fbdf8.pdfIn PDF document text
    • https://bebibamo.weebly.com/uploads/1/3/1/4/131438385/bepatupibezero.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/fgeXJgc/81095330921.pdfIn PDF document text
    • http://newapegujopabi.22web.org/74496919972.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/rodiligarexo/14544837533.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/suspension_letter_format_for_school_students.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_off0000c1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EC 5140 bytes
SHA-256: ac1e437c08b7ef8392fd887c72ab697b3749043fc641e4743a99b7c10d9d798e
font_01_sfnt_off0000d3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A1 9896 bytes
SHA-256: bb91ea28237d73b5af2b4f47e1ef00ade2642ae443c29c7abd4c3aa7f06f56bf

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