Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c4fdccecce5466…

MALICIOUS

PDF

70.5 KB Created: 2020-12-20 21:43:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ba208e8d02023eb931357a4931f985e SHA-1: 1ff3ab4f8fc91e811e85f6c390d2672ac351a9d3 SHA-256: 36c4fdccecce5466dd38244ad0c5e9bc89d78295fae263eda8e414db2d91b36f
156 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 dynamically generated and point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The embedded URL and the document body, though obfuscated, suggest a lure related to unlocking a phone, likely directing users to a phishing or scam site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafficel.ru/123?utm_term=unlock+at+t+lg+g3+phone
    • https://tigizojotajubum.weebly.com/uploads/1/3/4/4/134489046/8432558.pdf
    • https://gavedomosuzutu.weebly.com/uploads/1/3/4/2/134234743/salofixogog-zirutenudizote-juvutukorufat-kakazo.pdf
    • https://komimuvupelogi.weebly.com/uploads/1/3/4/3/134312664/3c3e4164fa150.pdf
    • https://static.s123-cdn-static.com/uploads/4423137/normal_5fcfb57f4687a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/3a9f4a23-bb85-4aab-9aba-e138d4ec6fca/wubisubazujo.pdf
    • https://static1.squarespace.com/static/5fbffcc36609fd0ee78c2f31/t/5fc185debc819f1cf4126c68/1606518240021/anna_akana_letters_to_my_sister.pdf
    • https://uploads.strikinglycdn.com/files/437b30fa-3f22-4381-abcf-7e82f24654f3/windows_10_system_image_recovery.pdf
    • https://uploads.strikinglycdn.com/files/c863cbbb-087a-4c9b-bd54-bf63b11f8b4c/46111272864.pdf
    • https://uploads.strikinglycdn.com/files/722d38a2-3b0a-44c6-8a5b-a6c0fc2f5a34/cuadro_comparativo_culturas_mesoamericanas.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf6021f3de5e49b55c0e91/1606377505986/sailrite_lsz-1_plus.pdf
    • https://uploads.strikinglycdn.com/files/4430f3d5-6dca-4940-b7ab-77e7595d3219/4596329537.pdf
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c804.bin
fc39fc09f9dac697a6fb13fa79820b61c3dc3eaeea83ff1d5db3be7cc4801386		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC804 4880 bytes
font_01_sfnt_off0000d899.bin
f8b737e458e9b8b4dfbb27db1aa1c46b0cb347ab941e48e6623cabda2f51d110		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD899 11360 bytes
font_02_sfnt_off0000ff46.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF46 4324 bytes

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