Malicious PDF — malware analysis report

Static analysis result for SHA-256 78631cb526f5f07c…

MALICIOUS

PDF

75.2 KB Created: 2020-12-19 23:09:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1080741f18bab59ce16177d2711fda77 SHA-1: 70820e6a526f8d73281d6c6cb23812d8aec0a724 SHA-256: 78631cb526f5f07cb66c687149fd815e333d4174b42dcf2e6a4118b3b42423ab
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also listed as an embedded URL. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'cool fonts for instagram bio mod apk' and urgency lures, suggesting a phishing or scam attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffmen.ru/aws?utm_term=cool+fonts+for+instagram+bio+mod+apk In PDF document text
    • https://zaxanedipujez.weebly.com/uploads/1/3/4/5/134582154/4d6721d5d2.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/5757932.pdfIn PDF document text
    • https://sopodepewujo.weebly.com/uploads/1/3/4/3/134340903/4231801.pdfIn PDF document text
    • https://jikurufor.weebly.com/uploads/1/3/4/6/134613562/tubaxipoja-pudeg-lozoretiroza-pukopagotilifit.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/samopakamefap/ambiente_de_trabalho_remoto_do_chrome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/493903d5-4636-47b7-8023-b8067383556b/lopukixudogil.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6588f27a199023ada6d7f/t/5fc80ab929238313ad6502b5/1606945465688/that_old_black_magic_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/55684913761.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/sadus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5416889-01d4-4148-be8f-28c4ef83f95f/77856248016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/884aeb2b-577e-4902-b99c-03c1fd439cde/95424870785.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A0 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off0000da85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 5472 bytes
SHA-256: df0e09329725d97474f5fe800c9b0d683ef3cb1f05c76b26713168d2dd44d93e
font_02_sfnt_off0000ed01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 16772 bytes
SHA-256: b8f9633140e6149c1b2199511a354e52d309a823cb84be4da65ff5164d3fd5d3

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