Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a41dc880fa6f39…

MALICIOUS

PDF

71.6 KB Created: 2021-01-06 12:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 02a265292bde9025f4918ae9e79a8600 SHA-1: 726cc61a10826679028d87e34437baaa2f422dc9 SHA-256: a3a41dc880fa6f39fbc135d57096009c835a9c6b608cc66782638cedf59a7d73
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 disguised as legitimate documents, indicating a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to trick users into clicking malicious links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/aws?utm_term=iti+departmental+exam+2017+answer+key PDF link annotation
    • https://bivitomelonex.weebly.com/uploads/1/3/4/4/134491730/c267643d97fc64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368466/normal_5f9e0edadc528.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377403/normal_5fee9710632e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449600/normal_5fb67e30a6ba3.pdfIn PDF document text
    • https://relowuforobelo.weebly.com/uploads/1/3/4/5/134528439/xokopumeramegaxiru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382196/normal_5f8b6d68aead4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476150/normal_5fdf3b29bb0ce.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/bupijila/avery_18160_template_google_docs.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/90742352339.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/775fe739-2f49-4d0e-84a6-b796f00fdda4/motuvume.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/android_master_detail_fragment_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/earth_science_reference_table_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07cf7e90-6c22-4ada-9a0e-cc07050151bf/felobofirotawuxiturupu.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/can_you_airdrop_android_to_iphone.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_off0000da05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA05 5772 bytes
SHA-256: 3f4a3a850499f7aaceb03ded055df18d0d7e5b4adcd69671d290348d6d3245ae
font_01_sfnt_off0000edbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBC 10424 bytes
SHA-256: ae169227c6d7f3624f4e527d2c1f8cd0c2c1db9c2c63e2c7d7fba47ef16bd830

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