Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff728cc96dc92d3…

MALICIOUS

PDF

79.8 KB Created: 2021-04-26 02:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3448e62a2900194c4182ff0b793721e SHA-1: d21d8662f2a0ff7e6a34b4722e42b4cca6fe6f2c SHA-256: dff728cc96dc92d37f95f6ab05bb64c4b83528788ed032120f68621aa2744cda
164 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 are hosted on dynamic DNS services or link farms, indicating a phishing or malware distribution attempt. The heuristic 'SE_URGENCY_LURE' suggests the document content attempts to create a false sense of urgency to prompt user interaction. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xajibur.ru/strik?utm_term=pokemon+adventures+box+set+order
    • https://cdn.sqhk.co/xadowififux/04jHYV3/83657896549.pdf
    • https://cdn.sqhk.co/toromerepowa/jbIcPIl/93744053419.pdf
    • https://static.s123-cdn-static.com/uploads/4493579/normal_60074974c1e2d.pdf
    • https://bovusobovazova.weebly.com/uploads/1/3/4/5/134596491/sirunexosawoban.pdf
    • https://cdn-cms.f-static.net/uploads/4378383/normal_5fe6a0ec35c45.pdf
    • https://munelexogetajax.weebly.com/uploads/1/3/1/4/131437313/gakaka_fisizop_kajisororopoku_pukenekumolaf.pdf
    • https://giromazipudu.weebly.com/uploads/1/3/1/4/131453901/9932296.pdf
    • http://zufunepel.iblogger.org/gta_san_andreas_cheats_free_download_for_pc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://mufumeg.rf.gd/clustering_real_life_examples.pdf
    • https://s3.amazonaws.com/wolina/log_log_paper_examples.pdf
    • https://s3.amazonaws.com/rozebofukixus/57347590784.pdf
    • https://s3.amazonaws.com/potofaw/ash_choosing_wisely_guidelines.pdf
    • https://s3.amazonaws.com/wolawatin/what_are_the_effects_of_climate_change_on_agriculture.pdf
    • http://totofexux.epizy.com/relative_afferent_pupillary_defect.pdf
    • https://s3.amazonaws.com/fapaga/guteju.pdf
    • https://s3.amazonaws.com/vesubodufisi/glacier_bay_dual_flush_toilet_instructions.pdf
    • https://s3.amazonaws.com/saziwijaxodav/6074437802.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e6.bin
2e60b4a918a441368f9c6659b6fd6c1ab64966d7b5ef0f9080e2542692b7b1c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 5104 bytes
font_01_sfnt_off0000fb25.bin
6ae25a26e3ee6ca2679247e67905d59c2e506b8a9f9859662eb9f1d77ec764f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 11504 bytes
font_02_sfnt_off00012241.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12241 4324 bytes

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