Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f44fad22f74f09…

MALICIOUS

PDF

69.7 KB Created: 2021-02-26 03:54:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e66174d5bacc56dc04027d3c8a6561c2 SHA-1: c15fd7bc5facef9482cf2b98c37a1a929ddfe8f8 SHA-256: 46f44fad22f74f095099a55c56009da0c652ad9d7f39cf2311e1ca0228d52110
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with one prominent example being https://s3.amazonaws.com/desenaz/20513868342.pdf. The embedded URL https://leonvi.ru/strik?utm_term=ingenuity+automatic+bouncer further supports the phishing or SEO manipulation attack pattern. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://leonvi.ru/strik?utm_term=ingenuity+automatic+bouncer PDF link annotation
    • https://fikosaxan.weebly.com/uploads/1/3/4/7/134753192/livuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472182/normal_5ffa4406efa5f.pdfIn PDF document text
    • https://gokejaxax.weebly.com/uploads/1/3/6/0/136056436/e1927.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497131/normal_5ff91523a174c.pdfIn PDF document text
    • https://ranixujofenak.weebly.com/uploads/1/3/4/0/134016935/ruwuvuwet.pdfIn PDF document text
    • https://muwegegedagus.weebly.com/uploads/1/3/0/7/130738526/620948.pdfIn PDF document text
    • https://tuwopabawebude.weebly.com/uploads/1/3/1/3/131382790/8235506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458838/normal_5fe7752697a8b.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/desenaz/20513868342.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/the_ruins_of_gorlan_audiobook_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/bamigowewebuguremis.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/76612672096.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/96493329955.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/vibir.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/18327809601.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_off0000d203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD203 5088 bytes
SHA-256: f680f4bf19980bc752d9d7fb7453a50111ef2d071fba4213524ef0b6547f86f1
font_01_sfnt_off0000e34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34C 10876 bytes
SHA-256: 7e3e82183aa53a385e8f4ba712175e0a3f02c985e4800b5cdfc11ce00fee166c

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