Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5ab9582cd096aa…

MALICIOUS

PDF

90.8 KB Created: 2021-04-03 17:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 301b2e8d0cb808335fdf02b529ebb8e4 SHA-1: 4eb14590cc7138ca759145ce326007a4aad50cd9 SHA-256: 1d5ab9582cd096aa6e05c39b0d432d6ce24d9c4122c6a51d7b5387c0f3f6e3ec
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, which is characteristic of SEO manipulation or phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://golowaki.ru/award?keyword=aisi+316+pdf PDF link annotation
    • http://wowit.pro/29718756463k52f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445737/normal_6027666099bcb.pdfIn PDF document text
    • http://stalekost.site/44058589919ywyzk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424007/normal_605f76e63f367.pdfIn PDF document text
    • http://dimanowogodado.22web.org/90589877006.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_a3954284c509440aa730d0a518ff91dd.pdf?index=trueIn PDF document text
    • http://tibupud.epizy.com/76658041250.pdfIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_cd02f57b91fb417d841ce273d60a3866.pdf?index=trueIn PDF document text
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_f5df02a7c1ef4ef9b222cd786167fb18.pdf?index=trueIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_f23baaad39ef4ae8b618d224ac184333.pdf?index=trueIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_ebda1e539dbd49abbb79a82df7943b80.pdf?index=trueIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_6ba1402534204c52a79dc785e0209531.pdf?index=trueIn PDF document text
    • http://tojuzurukepise.epizy.com/rujabofipesupirev.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_0d56f0f38a4b4a128e4d3eba4e624d9c.pdf?index=trueIn PDF document text
    • http://ruxopagotar.epizy.com/nimulanevikib.pdfIn PDF document text
    • http://kujafugakare.epizy.com/alberta_ski_resorts_snow_report.pdfIn PDF document text
    • https://34fef40c-4934-4c56-b24d-59915ed92566.filesusr.com/ugd/806295_03fcec316c0a48eaa671d69e9528c70c.pdf?index=trueIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_1926ca81de8e443e9f7694e0f9db2b5d.pdf?index=trueIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_e31ec9088cc3416098a33c3c53e9ce54.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D4 5056 bytes
SHA-256: 270b68100a23b5913d5cd1e7aef15f15b51a42a71c5e3195d91eb9c5f17d92cc
font_01_sfnt_off00011b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B28 12708 bytes
SHA-256: 07a940a24bd699da67005d329f3fca0fac9f74249fc64a8cf37fe8946d8ef5c2
font_02_sfnt_off00014522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14522 17120 bytes
SHA-256: 1062150508c48550ccda09a259aeff38eb7bf4d459e667f02d13059b87293fd9