Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7de3235e2663ae…

MALICIOUS

PDF

82.3 KB Created: 2021-03-22 10:33:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 953be915693a4306a445d0462231fa78 SHA-1: 5a9866b11ac585cebc07e430e1e4a74725ec1655 SHA-256: 7f7de3235e2663ae2cff260dcbb244a816d5f77867eb2a62860e31b88f394152
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://kuzutuzo.ru/award?keyword=manorama+yearbook+2020+pdf+download PDF link annotation
    • https://radebijudowax.weebly.com/uploads/1/3/1/6/131607027/todupezemet.pdfIn PDF document text
    • https://giwuvapelefawi.weebly.com/uploads/1/3/4/8/134869604/5827777.pdfIn PDF document text
    • https://jotogenawe.weebly.com/uploads/1/3/1/4/131406354/1869075.pdfIn PDF document text
    • https://cdn.sqhk.co/buwowunuras/tzjhgjM/wonenogumexi.pdfIn PDF document text
    • https://cdn.sqhk.co/lebinezekoma/bMN72WG/blue_pottery_designs_drawing.pdfIn PDF document text
    • https://gukilebulasule.weebly.com/uploads/1/3/2/6/132682884/1ee5edc6025.pdfIn PDF document text
    • https://fotawadibegul.weebly.com/uploads/1/3/1/1/131163643/muwosu_norivetogoxujel_fokajavifodo.pdfIn PDF document text
    • https://cdn.sqhk.co/xubenijevewe/5gdEx2s/popifo.pdfIn PDF document text
    • https://cdn.sqhk.co/teganipuputu/iX066lN/kaloxarekigimevoninu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424637/normal_5fffcf00702f4.pdfIn PDF document text
    • https://cdn.sqhk.co/sebuwemid/UgfzThe/pagonefumaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427287/normal_601a043759401.pdfIn PDF document text
    • https://lefilima.weebly.com/uploads/1/3/0/7/130775934/9157950.pdfIn PDF document text
    • https://xudapunazegiwav.weebly.com/uploads/1/3/2/7/132741045/08395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413714/normal_5fdba7e01f918.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/243cc201-6c2f-4c8f-af2e-ed135e055016/how_to_improve_leadership_competencies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97011638-ddda-497e-8ba6-dc7911880639/viktor_frankl_memoir.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
    • 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_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 5684 bytes
SHA-256: ed4b27f809e8c2022c7bbf95f22fd6f9bfc813687b2acbe534caebc1622550cf
font_01_sfnt_off00010195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10195 10864 bytes
SHA-256: afc8d256c11071a1af4d8478e51f7be3217226ce4b2a67d581440aa880c28df8
font_02_sfnt_off000126d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D2 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1

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