Malicious PDF — malware analysis report

Static analysis result for SHA-256 923a4cfc267ac6b7…

MALICIOUS

PDF

72.6 KB Created: 2021-03-12 15:15:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6b42128304688043756793470d2d751d SHA-1: b62db3c97300414a114ded51efaa5f7b615bfa56 SHA-256: 923a4cfc267ac6b7555ffb997829b9ba8e351927a57c8f52ec08f868bb687e5c
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning and distributing malicious content. One prominent URL, 'https://ponafet.ru/award?keyword=sahih+al+bukhari+free+download+pdf', suggests a lure related to book downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/award?keyword=sahih+al+bukhari+free+download+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408996/normal_6025af1a863ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454299/normal_5fc61028cc814.pdfIn PDF document text
    • https://bubinaxe.weebly.com/uploads/1/3/2/6/132681619/luvijivubokakokexe.pdfIn PDF document text
    • https://nobopejulalajib.weebly.com/uploads/1/3/4/6/134621416/ca3103b7.pdfIn PDF document text
    • https://mifeweravu.weebly.com/uploads/1/3/0/8/130874314/fesizatokebepupajane.pdfIn PDF document text
    • https://motanufogok.weebly.com/uploads/1/3/1/3/131381166/8b8818e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381108/normal_5fdb56758d6ee.pdfIn PDF document text
    • https://funesovikigaje.weebly.com/uploads/1/3/0/7/130740183/3547637.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/fodose/negevabikip.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/24181367045.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/photoshop_name_card_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/42488607288.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/cobra_car_alarm_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd7a4c7f-7ef6-41b7-9128-43ffdb2e3f49/keurig_elite_iced_coffee_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/vupuj.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/piriformis_muscle_spasms.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/lagu_sara_bareilles_brave.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/67732084527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a3a90c1-1b66-424b-b2b5-6e7e62baabc5/hp_stream_11_ak0502sa_11.6_intel_celerontm_laptop_review.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/alesis_dm10_mkii_pro_kit_module.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/84196326920.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/79425816670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2204e37-d2d0-4ae8-b6c3-a3665ca86ae5/wutovawixoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/792c2895-e0c2-4cf2-a704-cbb513ea8968/71573441260.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/fm18_keep_scout_reports_up_to_date.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_off0000dfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD4 5352 bytes
SHA-256: 44355ee3225da15d61f8d06b52bdedb6edc778736ade3bbb39566c7f614cc1f9
font_01_sfnt_off0000f20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20C 10032 bytes
SHA-256: bcbcb370de254035e3c1d3a5ec39b64a7b22c5bab7d6ed880a3a414e221f892d

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