Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c41174cc721085…

MALICIOUS

PDF

69.2 KB Created: 2021-02-17 19:10:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 408d4a0c3433af77c6c97f62c76fa446 SHA-1: dae19cb476ec30ee4f428c441f7dbaa3228e05f4 SHA-256: b4c41174cc7210859db5a501bbdf98c8f5b17dd82b0ded357c625c0469051cd6
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 of which point to suspicious or unknown domains, indicating a potential link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://seumenha.ru/123?utm_term=how+to+hang+a+ceiling+fan+without+a+downrod PDF link annotation
    • https://pagejenaxupiwig.weebly.com/uploads/1/3/4/3/134383440/sanebuxaf.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/w2hghjj/panda_bubble_gum_print.pdfIn PDF document text
    • https://cdn.sqhk.co/raxinosi/kicqgdB/15788721994.pdfIn PDF document text
    • https://fonomekaleguv.weebly.com/uploads/1/3/5/3/135308628/f1c1d3c8.pdfIn PDF document text
    • https://xivanolub.weebly.com/uploads/1/3/1/3/131380121/wotowojoxad-zitodar-vewagobumepaf-poviwe.pdfIn PDF document text
    • http://wdd13.ru/asme_code_case_2235_9lr87e.pdfIn PDF document text
    • https://sumeropesoxiv.weebly.com/uploads/1/3/5/3/135316328/xaloxomezotaviz-vewuwaxajeros-bosuxelunejibot.pdfIn PDF document text
    • http://private-channel.site/88382280822888w0.pdfIn PDF document text
    • https://bakofegep.weebly.com/uploads/1/3/1/3/131382808/bujenewakuvotu.pdfIn PDF document text
    • http://zerkalo-fugicar.website/dead_trigger_3_mod_apkw54bb.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/sazariwapa/bodoragitovep.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/candy_crush_saga_hack_apk_unlimited_gold.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/megudapipogiwazibipaz.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/bhaskara_satakam_padyalu_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/27139130687.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/mixed_parallel_and_series_circuits_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/20336983207.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/75243694307.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_off0000d2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DF 5156 bytes
SHA-256: ef903b195fc73d3dd2ff7e6dc82b645690411e97e9b9ffd8adf01fac4b735967
font_01_sfnt_off0000e47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47D 10324 bytes
SHA-256: 0c093dd5643f9204ba60467920094b52f045266752895f1dc0aa3aec92f695b2

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