Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c81a4ee7dabbaf…

MALICIOUS

PDF

75.2 KB Created: 2020-12-04 18:09:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a1a218bd46001fc7474a21fe1f1fbec4 SHA-1: 0efbad8ab542a6eaf0ffda08b6dbbec439a25716 SHA-256: a5c81a4ee7dabbafe67aa465aff552ad72732d7f75fa039fecc9f8643f2d8fc9
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URL points to a site offering a 'poweramp full apk download no root', which is a common lure for distributing potentially unwanted or malicious software. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to trick users into downloading software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/123?utm_term=poweramp+full+apk+download+no+root PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484370/normal_5fc24588e759b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387571/normal_5f9b75cce0714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451027/normal_5faeb4d89d4c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_5fbdf40abc5b5.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/41573f98-9b4b-45b9-b245-5d0980c6ee05/62806814900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e5f317f-7b11-4231-8471-c56abe488f94/porsche_928_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7061fd1-f59b-46b1-a144-118c164421c0/fowuraxesek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13f7f97c-bdc0-4a7d-8acf-089d5f4a57a8/58813983998.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e80068612547ed5e2b99/t/5fc1e5fd4e98326c025546cd/1606542852699/excalibur_prime_or_umbra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94b026c5-dc5a-4633-868b-f2c1030f0923/this_is_me_sheet_music_the_greatest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c23e4d82-ef53-4bdf-8736-ae07d62849ec/tironerus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ba9fc42-4621-40f4-9b3b-b4848a4d44b0/67104631720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c861b904-98f7-4873-beb6-c88bb2f8f175/vowok.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DB 5164 bytes
SHA-256: 868d319c7a5729e37a13200cbdd0e048d1e37c306205e433b507adf3ef8080c9
font_01_sfnt_off0000e26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 11712 bytes
SHA-256: 080fa98646ca67dda028fb57f4aaf94b401fe20730ade4cbb7256dcf19c15600
font_02_sfnt_off00010a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A90 16248 bytes
SHA-256: cacce353daa52449aaa2dc03ff14e12d7f37b8e2e541d6bae97b449db5f5a003

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