Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9034f262bdd298…

MALICIOUS

PDF

112.2 KB Created: 2021-05-25 01:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0f6f89b1234a7611edf31049f718840d SHA-1: e357ff6f1649128a5d3c544530f6e4a1ca699ad5 SHA-256: ac9034f262bdd298386e194a37636b38e90dbbb6a4cdd0ea5a35dfe9e6e0b35b
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 other PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=pooja+sankalpam+in+telugu+pdf+free+download PDF link annotation
    • https://kofetasug.weebly.com/uploads/1/3/0/8/130874362/5019351.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476416/normal_5fd0477da78ec.pdfIn PDF document text
    • https://takigufumugo.weebly.com/uploads/1/3/5/3/135345847/4240756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416150/normal_6045fcb832654.pdfIn PDF document text
    • https://nigomisenavuluw.weebly.com/uploads/1/3/6/0/136095850/fdbd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368245/normal_5ff9e5e1a9e5c.pdfIn PDF document text
    • https://vumukawa.weebly.com/uploads/1/3/4/6/134662430/ximoxez_rubitikepiti_polemogodo_tutaxukubu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370066/normal_603e82c692aad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_603aa06e46df7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/osha_safety_standards_for_manufacturing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/157eafd9-ec3d-4ef2-b8b1-0c07f17bb064/best_3d_animation_software_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/video_er_app_for_ipad_2.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/55253678089.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/whirlpool_refrigerator_rebate_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/net_framework_3._0_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/56223612391.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/54179477960.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/dd_5e_players_handbook_classes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/509cb257-e50a-4ad4-a8dd-fa201865ae35/96440187933.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C9 5596 bytes
SHA-256: f212dc0171bb84e56cc0331e88936a197ed8326e51cc7483ebe24fc488a3dcaa
font_01_sfnt_off00010cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD6 72288 bytes
SHA-256: 8d7cf63bb960e5958290f8beb231eae00ab6f001307148494c5e8fee60788d10
font_02_sfnt_off00018cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CD7 10176 bytes
SHA-256: 3458f9ced8a0e8e15ee6ac86d183a6172d1f0168f081a89654db1be5acd96f49

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