Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc26d20645ac5e5…

MALICIOUS

PDF

73.8 KB Created: 2021-02-20 18:21:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 41277984d81b71baf84c17a96684b4fb SHA-1: 70e4dd403f1dce140c2a4e11a0d0f9048e94bc77 SHA-256: 7bc26d20645ac5e54f4a05b9925fea9a1e53c0269ca7cca2d50aca48ecaf9916
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 to potentially malicious or spammy domains, indicating a link farm or SEO spamming attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to host these links.

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
  • 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.
  • 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://leonvi.ru/aws?utm_term=what+is+the+meaning+and+nature+of+deductive+reasoning PDF link annotation
    • https://cdn.sqhk.co/xamitarerivu/gg6hhgj/tubemate_3._2._14_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/eheijhb/vimuma.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/hgdRgib/69829234133.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/cjBjaha/1458059175.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/W1r7bq4/rikaji.pdfIn PDF document text
    • https://cdn.sqhk.co/linigurep/dgdxghX/34350597361.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/sk4Nhjb/best_tactical_knife_with_glass_breaker.pdfIn PDF document text
    • https://cdn.sqhk.co/jafiwimeg/EwjgZha/15017718610.pdfIn PDF document text
    • https://mubatizusilaboj.weebly.com/uploads/1/3/4/4/134475350/taxibilawow-denidarup.pdfIn PDF document text
    • https://cdn.sqhk.co/demejapad/jjhaije/jabelidop.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/Cjcjhgc/olympics_2016_track_and_field_usain_bolt.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/borokegujuzero/add_text_to_mac_os.pdfIn PDF document text
    • http://penisidisipifo.rf.gd/miwasog.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/bhoot_comedy_video_mp4.pdfIn PDF document text
    • http://sawopigemon.epizy.com/jetiwifejovakaxinam.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_off0000e132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE132 5476 bytes
SHA-256: 579b3162397043e1c88edd3f14e9158a44caf877a45bcca6be1837ff7c9a0de7
font_01_sfnt_off0000f3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BA 11296 bytes
SHA-256: 56938401f9dc9028f670b1d0061c2ddc0e1278a6013a5f7c6e77373aa3caafff

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