Malicious PDF — malware analysis report

Static analysis result for SHA-256 5658e99f99ccb448…

MALICIOUS

PDF

94.0 KB Created: 2021-05-02 11:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1ce7de542c2fdec0bde46b3c4f6a37d3 SHA-1: c70f8e41730671612d2a19c60290aa2204321545 SHA-256: 5658e99f99ccb448fbefbc29bb5970d2f46fa2138433718facccd552248aa86b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers identified this file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document's purpose is to redirect users to malicious or deceptive websites.

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://baarspo.ru/strik?utm_term=how+can+you+fix+brain+fog PDF link annotation
    • https://cdn.sqhk.co/rivotoxupow/igOTdgf/37367062476.pdfIn PDF document text
    • https://fulotetaputu.weebly.com/uploads/1/3/2/7/132740707/zakuja.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/algebraic_expression_lesson_plan5tqle.pdfIn PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/jbjfqge/97590531682.pdfIn PDF document text
    • http://trysucre.pro/lenovo_y50_specs_i5bezcf.pdfIn PDF document text
    • https://cdn.sqhk.co/koxopumo/jeB9ji8/monurelopofi.pdfIn PDF document text
    • https://vepaxanejabag.weebly.com/uploads/1/3/4/3/134317352/davejomefobapajem.pdfIn PDF document text
    • http://vilopeg.xyz/23793174936bwkub.pdfIn PDF document text
    • http://wowevopopof.22web.org/bbc_scotland_news_sports_reporter.pdfIn PDF document text
    • https://laregokirula.weebly.com/uploads/1/3/0/9/130969776/vidogekukabof-saforuzuxorejub-wonibifoso.pdfIn PDF document text
    • https://givodevivunafa.weebly.com/uploads/1/3/1/8/131871579/jipif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fapibudu.epizy.com/lagu_123_wo_ai_ni_pinyin.pdfIn PDF document text
    • http://fadifisevak.epizy.com/disoneguvugopukid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda7264b-f47c-48aa-9a2c-08c58b713d43/al_quran_online_mp3_download_with_tamil_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f12cfab4-ea0e-4465-a684-266ddd728e47/gafavixojonelimodalaretuf.pdfIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_ccc3e3f9b9284cb190061a3e5a5a90dd.pdf?index=trueIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_215b4cb9e86045dab77374dfb2b38dfc.pdf?index=trueIn PDF document text
    • https://8460bee6-64ee-4fc9-83c4-9003ce4955c6.filesusr.com/ugd/5ecadc_cea4d9d76523485c88d4852c71c9ec41.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_off00013117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13117 5200 bytes
SHA-256: f42545f21c9c4cc390653274a225d3ec4694978aa0b3c2f9da8f94779d42050a
font_01_sfnt_off000142ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FF 11384 bytes
SHA-256: 34f064af7dae01937b7fd64cba9457d541e2d805c8a91e3d15272d392ce810ad

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