Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc6359f80bbe440…

MALICIOUS

PDF

75.8 KB Created: 2020-11-18 03:19:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 02774ad41b86913577b14ffead07c3f7 SHA-1: 1e58a667db3355efa5ede4a2cce430a073c18ea0 SHA-256: efc6359f80bbe4401e4c0d1e5a1d9c30d422d058db730d7f178d3b354b81f8d3
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 0.9997

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://trafficel.ru/strik?utm_term=edelweiss+eiden+fantasia+walkthrough PDF link annotation
    • https://vubisurajoguv.weebly.com/uploads/1/3/4/2/134265568/toburazip.pdfIn PDF document text
    • https://kojelokawuzu.weebly.com/uploads/1/3/4/3/134341929/5673163.pdfIn PDF document text
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/finagakasokaruxug.pdfIn PDF document text
    • https://mekuxiwefajup.weebly.com/uploads/1/3/0/7/130739023/rigodapotor_dudopoxa_sotalikepe_zibogora.pdfIn PDF document text
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/e4e04ccb83ff3.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/4707947.pdfIn PDF document text
    • https://moleresudiba.weebly.com/uploads/1/3/4/4/134447347/2002682.pdfIn PDF document text
    • https://lixezakokigek.weebly.com/uploads/1/3/4/5/134596317/zibizitimisibog-xipapebot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/descubre_2_workbook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/49737531789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/893067ce-fd87-4076-9343-8f59ec86503b/ridgefield_tax_collector.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8756a5b-e2b3-4746-a49d-5d11ad54a380/9472829948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e0a441-45e6-4989-bcb4-958af5aeb5ed/pimunikibaboko.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF65 5164 bytes
SHA-256: 2dd38790f714be5400147b92428e3fac5b151aa33316543a6263ab9a9a7bd043
font_01_sfnt_off0000f104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 10224 bytes
SHA-256: 7b31f83e99b5e2d6883ab87607cbc29332d9f6f72e88c70454ee80a8145752f7
font_02_sfnt_off00011418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11418 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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