Malicious PDF — malware analysis report

Static analysis result for SHA-256 0636dbce7337ab12…

MALICIOUS

PDF

66.0 KB Created: 2020-11-23 05:09:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5750fbab783279912aef4f5c10c87ad5 SHA-1: 3c1f189a0cde47f3b4081d85993ee1e6c0bdea77 SHA-256: 0636dbce7337ab126e555764d6c0e19bc480f136734acc16c3b04164b76313ce
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of a 'download button' heuristic and an external URI pointing to a suspicious URL suggests the document is designed to trick users into downloading a payload, likely a trojan or phishing-related malware. The document body, though heavily obfuscated, contains references to 'Facebook lite handler apk 2019' and 'wkhtmltopdf', hinting at a lure for potentially unwanted or malicious applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://trafffe.ru/123?utm_term=facebook+lite+handler+apk+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402710/normal_5f9153d33d62c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381344/normal_5fab371d065ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470982/normal_5faaea1d1a9c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c2c4d6e-e913-4d18-970b-269cc92dce2b/cuisinart_soft_serve_ice_cream_maker_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d76c68a-05b3-4456-aa0c-8a524d877a65/82681058171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c41efbad-499b-4b0c-97eb-afe9106d5039/return_to_vendor_process_in_sap.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/bars_and_melody_better_now.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/konar_tamil_guide_for_class_8.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/engineering_drawing_handbook.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/fazosopopaxosabek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7cae93e-e7f2-4cdc-af60-531cead474ca/51700691831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f3dd4b6-23e5-4d7d-b32f-8ec92211388f/fuwanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41f9b35b-4ca4-4a26-8b2d-28ed53af7e45/jukupakuvigateritekipiran.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9678143-59bd-407f-9372-a3f17b88fe73/1240922819.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_off0000c5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E0 5624 bytes
SHA-256: 83492fede6d7501167280e2edc2cb9d67b7ffee4260addd6d498d2cc06935533
font_01_sfnt_off0000d8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F4 10356 bytes
SHA-256: 30dcaac6a0b96eb82c7c3bb34bf477af4d1cd0994ee9accc7b228e5a6b298f50

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