Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde438ee50faca74…

MALICIOUS

PDF

73.4 KB Created: 2021-03-06 04:30:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a07afbd82a115a433cfabb2cd67101da SHA-1: abee2ad768b4bde9238cf01dde44841efa70a8aa SHA-256: fde438ee50faca74fbd6965ac73c91c8939ef4d4a5c35a0d0acf0e171fdfb36f
196 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including PDF_SEO_LINK_FARM and PDF_SUSPICIOUS_LINK_LURE, which point to external websites. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely used for phishing or to download further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/award?keyword=neil+anderson+steps+to+freedom+in+christ PDF link annotation
    • https://watinamubil.weebly.com/uploads/1/3/0/8/130813586/1ebcb14.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/ha0w0Bc/lojinixiwos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487431/normal_60182ebabda81.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/notary_acknowledgement_formxspyz.pdfIn PDF document text
    • https://cdn.sqhk.co/vunelebu/fjegegd/wosesosaxasarepizataletag.pdfIn PDF document text
    • http://whysmall.space/japanese_american_porns7wpm.pdfIn PDF document text
    • http://sungo1.space/sound_effects_wikipedia6lyhb.pdfIn PDF document text
    • https://galevegu.weebly.com/uploads/1/3/4/5/134507196/pijujovefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382617/normal_60326e41e59e8.pdfIn PDF document text
    • http://walkover.me/physiology_textbook_by_sembulingamtmhh1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490269/normal_5fe91e221dce4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411932/normal_601840634b2cf.pdfIn PDF document text
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/zilamipugolox_likikobumoki_mekarasub.pdfIn PDF document text
    • http://letnesil.xyz/mokajigakimomebszsgw.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/sajatofubote/15774604100.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/outdoor_advertising_business_plan_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b65aca-f6cd-476d-b094-1f4d5c811cc0/86306330897.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/dowawowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8d1294d-3eae-433e-9dc5-563d2a13394a/20470834879.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/redixaziwejamebumiw.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/walmart_onn_tv_mount_video.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_off0000e486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE486 5364 bytes
SHA-256: 187556fefc072cb0adaff8aab265d2055c70b89a391c2ad13c9483cbe124056f
font_01_sfnt_off0000f69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 9888 bytes
SHA-256: dc6881c14e906dee5c0b344af462930823e1fdb555df160cc35e9f491ed01452

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