Malicious PDF — malware analysis report

Static analysis result for SHA-256 957dd27c979771f8…

MALICIOUS

PDF

79.8 KB Created: 2021-05-15 04:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f56c2bb2b55e4f26122402878af27b40 SHA-1: 69546304d4d98098a6a63538909f3bc46d23b8ff SHA-256: 957dd27c979771f8a211f9a78a86a69e6ccd49615ca14d110f4e80a8b7dd92bc
186 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or scam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://maypoin.ru/strik?utm_term=lucky+bracelet+color+meanings PDF link annotation
    • https://posapana.weebly.com/uploads/1/3/1/4/131454172/kadib_siwup_gifupexaxokuzab.pdfIn PDF document text
    • https://mezamavizasiv.weebly.com/uploads/1/3/5/3/135312133/5ee24af0a.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/1-99_crafting_rs3_2019.pdfIn PDF document text
    • https://libodarupebixab.weebly.com/uploads/1/3/0/9/130969674/2d85a.pdfIn PDF document text
    • https://xanuvewetarew.weebly.com/uploads/1/3/4/7/134732967/masegukejoru_togoka.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/british_english_phonetic_symbols_with_examples.pdfIn PDF document text
    • https://doluduzugemuj.weebly.com/uploads/1/3/1/4/131411539/3becebe9f5c6b7.pdfIn PDF document text
    • https://vejugowe.weebly.com/uploads/1/3/4/5/134506523/06e91f515.pdfIn PDF document text
    • https://bododomeliba.weebly.com/uploads/1/3/1/4/131408614/3448197.pdfIn PDF document text
    • http://bijepitujutix.sportsontheweb.net/ti_nspire_cx_student_software_free_download.pdfIn PDF document text
    • https://kagepumesafoke.weebly.com/uploads/1/3/4/8/134846889/677fa75.pdfIn PDF document text
    • http://duwelizub.mywebcommunity.org/xujifebufadatetadarugo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_0bee1e29e70c46b681dfbcaa9134681f.pdf?index=trueIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_ee01b5283e70409ea34ae707dd797f25.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb5acde-3590-488c-a2f2-9e527f417f7b/40875860288.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_2eb8fd608cb74ab7a3d49b692534bfe6.pdf?index=trueIn PDF document text
    • http://loxupobupibim.atwebpages.com/tratamiento_acalasia_esofagica.pdfIn PDF document text
    • http://kugukokoner.myartsonline.com/luzedubitoxomid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f0ebdad-a688-4d6b-b13b-72769e0de07d/14686612841.pdfIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_a9edf4570b794e19899b9c6e7500ac4a.pdf?index=trueIn PDF document text
    • http://wotidupodugi.myartsonline.com/auxiliary_verbs_usage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9de9b70a-ecfe-4013-bb3f-6345fa5d51e9/parents_emotional_blackmail_against_love.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e02d769b-c954-4d3c-9fcc-e2688f668bda/introductory_quantum_mechanics_solutions.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_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 5368 bytes
SHA-256: 8d77537d528b6cffc7ca5866095ff0e1df8b680a85bd1e21f60ce334d90a4a2b
font_01_sfnt_off00010dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBE 10528 bytes
SHA-256: 7e8ee13b275304012c755ff08666fa06a533829a145af9aaf18912f3aaa5a9df