Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbda7368c4957bb…

MALICIOUS

PDF

164.7 KB Created: 2021-05-17 07:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2827e9fee132b262e566d14f6568a4c4 SHA-1: 13756683f122e0aaf4197e59abbb00c713a3f382 SHA-256: 1cbda7368c4957bba91c230a7feb776740b1c6866d5909b4fca210ae20bebced
96 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external URLs suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pelibifir.ru/strik?utm_term=asp.net+mvc+asp.net+core+mvc+%25E9%2581%2595%25E3%2581%2584
    • http://afracheat7.xyz/kokotefokavifezubobuxawa7ik1e.pdf
    • https://static.s123-cdn-static.com/uploads/4501654/normal_5fde5a7b24b2b.pdf
    • https://static.s123-cdn-static.com/uploads/4446034/normal_5ffbb05571748.pdf
    • http://myirn.icu/15888556859xh6tl.pdf
    • http://rocketdocs.us/viewtv_at-300_manualje4sd.pdf
    • https://cdn-cms.f-static.net/uploads/4449399/normal_600edb3aa40a5.pdf
    • http://topchambre.xyz/maytag_front_load_washer_disassemblyc5qkc.pdf
    • https://patewowuxafopon.weebly.com/uploads/1/3/4/5/134595548/4645f92.pdf
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdf
    • https://cdn-cms.f-static.net/uploads/4490367/normal_606c8d9920a89.pdf
    • https://wutusexiradolo.weebly.com/uploads/1/3/0/9/130969471/eb55673db.pdf
    • http://qupieasy.online/40183425716uzy2i.pdf
    • https://cdn-cms.f-static.net/uploads/4413573/normal_60167c0601c59.pdf
    • http://fruitnaturs.space/internal_medicine_pocket_guide1h1f7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_6a1a237e60524565926c09797150f0df.pdf?index=true
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_6a4917b472e74b99be70e343cb2e5ad9.pdf?index=true
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_df5ca2920a1740f5bf7bbbdea4c594a7.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f10e.bin
48221aff58b325719f0b32b7446a6abc982202815ae364b945ef76c071a81e10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 105712 bytes
font_01_sfnt_off00022a4e.bin
46bf639f47b0efa3f92939951147c2b4bc0bce97640d05fd2d14e5fa95a7e155		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22A4E 3380 bytes
font_02_sfnt_off00023651.bin
10fd8e35b75fa20d875febe9f4c20579ed88bef562f04805fdca568b7e0b6355		 pdf-font-stream PDF embedded font (sfnt) at offset 0x23651 5128 bytes
font_03_sfnt_off000247ba.bin
d4b2135c0531cc5268047db8d81ba5628740a8714fc21034c3a9fd5da7feeb30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x247BA 10944 bytes
font_04_sfnt_off00026d27.bin
31f54bf1b2a0bd5fcefce680aa7bc0ab7b2c48a0f9a6877104dd616c0c0a5462		 pdf-font-stream PDF embedded font (sfnt) at offset 0x26D27 16160 bytes

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