Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9ae94f4a0a54c8…

MALICIOUS

PDF

99.3 KB Created: 2021-06-13 03:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c76f55d059e3a60903004bf3a39d4e5 SHA-1: 6b28073af8188d3de3062cf272cb6e349b55458a SHA-256: 3a9ae94f4a0a54c88b643a4bed280af2b9c3cbb9b1510d42dbe447158b902cd5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDFs hosted on various platforms, suggesting a link farm or phishing campaign. The presence of a URL referencing 'stardew valley iridium pickaxe' indicates a lure to attract users. ClamAV and ML heuristics confirm the malicious nature of the document, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://irlanc.ru/pbw?utm_term=stardew+valley+iridium+pickaxe+id
    • https://cdn-cms.f-static.net/uploads/4421350/normal_600e26e9b1dcb.pdf
    • https://cdn-cms.f-static.net/uploads/4425908/normal_606a5f8334387.pdf
    • https://static.s123-cdn-static.com/uploads/4488101/normal_5fd08d94cc3b6.pdf
    • https://disezoken.weebly.com/uploads/1/3/5/3/135327633/vikulonomaf.pdf
    • https://navubuxodogonid.weebly.com/uploads/1/3/5/3/135327143/fojokupafizasegadusa.pdf
    • https://kuvopesi.weebly.com/uploads/1/3/2/3/132303138/8506583.pdf
    • https://static.s123-cdn-static.com/uploads/4444864/normal_5ff0726a86d5a.pdf
    • https://wosufixojiniki.weebly.com/uploads/1/3/4/7/134720754/5989262.pdf
    • https://jotuxopa.weebly.com/uploads/1/3/4/2/134265841/siwuximuxizor.pdf
    • https://cdn-cms.f-static.net/uploads/4403128/normal_602faa091dd93.pdf
    • https://makumagem.weebly.com/uploads/1/3/4/3/134373862/4566686.pdf
    • https://nidupivulef.weebly.com/uploads/1/3/4/0/134042353/5f8f99ab218.pdf
    • https://vepimogarib.weebly.com/uploads/1/3/4/8/134856589/bc4cef3.pdf
    • https://cdn-cms.f-static.net/uploads/4501975/normal_5fd9887cb8379.pdf
    • https://wivesape.weebly.com/uploads/1/3/4/5/134510767/7521071.pdf
    • https://zitavumerut.weebly.com/uploads/1/3/4/4/134465292/sugepixegilo-sivivezig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/64d43035-588f-422d-9621-15ae075225e7/how_to_cite_online_sources_in_apa.pdf
    • https://uploads.strikinglycdn.com/files/39103752-b6be-4e86-bec6-15490753fa46/liredefizilobisil.pdf
    • https://uploads.strikinglycdn.com/files/1ae8b19f-d1a0-4328-ba06-9447b6d283bd/10180075631.pdf
    • https://uploads.strikinglycdn.com/files/ad745cd4-f375-4766-a883-8b1a7d9a3a08/highway_capacity_software_training.pdf
    • https://uploads.strikinglycdn.com/files/8138fc4d-b817-4304-897c-8954a67583ed/seboxazubobupiverewe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000138ad.bin
0ab5780ae59e638e2c0b257fe38488a79adcd2b774bfa2363c74a13e68b04026
pdf-font-stream PDF embedded font (sfnt) at offset 0x138AD 5196 bytes
font_01_sfnt_off00014a78.bin
671c7018f176cad057da6d06e5d1b2dd433b3f01863ead14b28314b2651d5b25
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A78 11552 bytes
font_02_sfnt_off000171d0.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x171D0 4324 bytes