Malicious PDF — malware analysis report

Static analysis result for SHA-256 195358c02694b118…

MALICIOUS

PDF

86.8 KB Created: 2021-02-15 13:45:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b4fb50a01fd7160a60f22d5d45e9a698 SHA-1: e2316e924e322e74743161f48226786b88343bf1 SHA-256: 195358c02694b1185a904a3f39055f64372146be649594204a28849a1fc6fb50
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and S3 domains, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and trojan activity. The document body, though heavily obfuscated, contains references to a humidifier manual, likely a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=vicks+mini+cool+mist+humidifier+manual PDF link annotation
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/96e52500.pdfIn PDF document text
    • https://dimafaxatabevex.weebly.com/uploads/1/3/5/9/135991177/lusefisi.pdfIn PDF document text
    • http://all-system7.work/jesuxawaxifufuranullvh.pdfIn PDF document text
    • http://tegor.xyz/lathe_machine_cutting_tools_nameoa0ik.pdfIn PDF document text
    • https://teviwodujote.weebly.com/uploads/1/3/1/4/131453741/buvazuxa.pdfIn PDF document text
    • http://gromstroy.com/bcmon_alternative_androidfd6ry.pdfIn PDF document text
    • https://pabidiwamudobav.weebly.com/uploads/1/3/5/2/135299897/db95a3b1c76cb4.pdfIn PDF document text
    • https://riviruzo.weebly.com/uploads/1/3/0/7/130739493/3143746.pdfIn PDF document text
    • https://rimixobavi.weebly.com/uploads/1/3/3/9/133987070/6468438.pdfIn PDF document text
    • http://ozalupa.space/5.1_mass_weight_and_gravity_worksheet_answers_with_workaz0o3.pdfIn PDF document text
    • http://kprovk.xyz/39976143482vhvmd.pdfIn PDF document text
    • https://ruvawuwejijexut.weebly.com/uploads/1/3/0/8/130814193/11e48543.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/fajetufekejo/3657394543.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/buvetewibodubekaniwi.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/nowodiwemoto.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/46477579507.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/givunosanovotafira.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/wheels_on_meals_soundtrack.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/danganronpa_art_style_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/nefujuw.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/best_online_expense_reporting_software.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_off000113d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 5292 bytes
SHA-256: b7312a4a144553932cf1afb3f12c1cd4a6b424e6eb2b002a4e3ed923cd7747d8
font_01_sfnt_off000125ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AE 12096 bytes
SHA-256: 7f8ef5f2972e905641045ff68e4d03f6bed477c6a8b53afa4877ccb39e65ee4d

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