Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1a57f9d6f90ccf…

MALICIOUS

PDF

76.6 KB Created: 2021-05-08 23:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b5ed3e5ba8705a04cf0fc2ef09a12982 SHA-1: 22c808cb7d57f21cdb91a2bc74085b575aa53587 SHA-256: 5c1a57f9d6f90ccf513243d5659fdb69e118d112d3e3e6cfed2408f39083343a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to potentially malicious sites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/strik?utm_term=autocad+lt+2019+price+malaysia PDF link annotation
    • http://kepuxom.mypressonline.com/bringing_down_the_house_book_free_download.pdfIn PDF document text
    • http://muvepifare.mygamesonline.org/clinical_anatomy_by_systems_richard_snell.pdfIn PDF document text
    • https://cdn.sqhk.co/kufezagivori/1LyjVih/horizon_credit_union_routing_number.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/hihhPjc/malaysia_palm_oil_price_news.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/bible_lds.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/3jchapT/hop_valley_brewing_company_springfield_oregon.pdfIn PDF document text
    • https://cdn.sqhk.co/budatumibowu/s8Ygjic/gubisutolelitira.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/BgfBgji/jidetur.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/3jjchgi/short_hairstyles_for_fine_hair_black_girl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a35b4eae-300a-44a5-b982-8d633984e519.filesusr.com/ugd/19735e_321efcaa13674fe995b20b9a49c45924.pdf?index=trueIn PDF document text
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_a84a63c3488e4bad801672a0080b9afc.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_14e2334520924dada0450f997ae33d7b.pdf?index=trueIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_1f4a31b949b6496c9a161579aa6ceb23.pdf?index=trueIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_7acefa315f6e4d4487433e426b7b2756.pdf?index=trueIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_fc9e0c6d756a413aa73f94cab3a2338e.pdf?index=trueIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_73787f6b0e4745509cad59e1746d6e90.pdf?index=trueIn PDF document text
    • http://pexirud.onlinewebshop.net/tawifilorufotemin.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_off0000ecdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDB 5792 bytes
SHA-256: 919716f9fe449dadb206e9e05ada43311fe95d591d24fdd395fce4baac2d455c
font_01_sfnt_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 10296 bytes
SHA-256: 9d05d8cf8c08109b0e71d33242065985713746c173310904f1c0fd81f99f9345

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