Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71faf3c28894e9c…

MALICIOUS

PDF

65.2 KB Created: 2021-04-20 01:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e2db60043f75c47c0079758e70d9743e SHA-1: f0c4af8fefbe721b65627578ba01959963de0548 SHA-256: f71faf3c28894e9cf10e4b5c55b60931b7fb3cbb87d32a4a0b1790ad6d921909
156 Risk Score

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 5

  • 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.
  • 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://fokemale.ru/strik?utm_term=grand+grimoire+chronicles+episode+2 PDF link annotation
    • https://towelekuw.weebly.com/uploads/1/3/1/4/131406253/fagugubuxogodup_folawet.pdfIn PDF document text
    • https://doparobisupof.weebly.com/uploads/1/3/5/3/135329684/dae7eb1abe4c0.pdfIn PDF document text
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/zopix.pdfIn PDF document text
    • http://thecet.xyz/e_myth_revisited_table_of_contentsoa7et.pdfIn PDF document text
    • https://pudosibax.weebly.com/uploads/1/3/5/9/135964381/80ec1d88a6aba5a.pdfIn PDF document text
    • https://fakibugopozap.weebly.com/uploads/1/3/2/7/132712115/642af8.pdfIn PDF document text
    • http://bcipreactivaperu.com/fulokedddogw.pdfIn PDF document text
    • https://nirotagikul.weebly.com/uploads/1/3/5/9/135992947/dizibixaloxatas.pdfIn PDF document text
    • https://funoridarudaru.weebly.com/uploads/1/3/5/3/135304061/lugasa.pdfIn PDF document text
    • https://mosofekux.weebly.com/uploads/1/3/1/4/131437457/joxerud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/76667431179.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/a_level_chemistry_periodic_table_edexcel.pdfIn PDF document text
    • https://d7504aae-3d37-493f-8789-a5629a6fcc30.filesusr.com/ugd/7ca9f5_27dae91a86bb4074af7a6f8443be47b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/murudute/chess_rules_in_malayalam_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/88700180412.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/27432749865.pdfIn PDF document text
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_fb20aee44f0b4e50ac4a736055e23496.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EE 5648 bytes
SHA-256: 57f97cf6fc2040a779eaf15a45f11c0b16a561690182e4915bb0b12fe4013de4
font_01_sfnt_off0000d3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FE 10424 bytes
SHA-256: bc0176b3c93361ae7a272030d28738823d9c422d816cb752ddb529b40fdbf339

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