Malicious PDF — malware analysis report

Static analysis result for SHA-256 4226faa7559b6008…

MALICIOUS

PDF

82.2 KB Created: 2021-01-14 06:22:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c24091f4629bb0815ffc9d698f63c363 SHA-1: 22384f76f0f0a4b035759c1c782266c65e139517 SHA-256: 4226faa7559b6008136751d137bba1f2abf4502996149810cc6f8d937ff65bce
184 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Smoke brushes for photoshop cs5'. The presence of numerous links on disposable hosting and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=smoke+brushes+for+photoshop+cs5 In PDF document text
    • https://cdn.sqhk.co/nalawanuxa/gjheZvP/42479936057.pdfIn PDF document text
    • https://komamopiragi.weebly.com/uploads/1/3/4/4/134444029/1950819.pdfIn PDF document text
    • https://cdn.sqhk.co/duzefodaf/vjfNkUK/screen_recorder_for_pc_win_7_32_bit.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/NghjdFy/tiger_sharks_eating_whale_carcass.pdfIn PDF document text
    • https://site-1172122.mozfiles.com/files/1172122/49871716237.pdfIn PDF document text
    • https://belaputeze.weebly.com/uploads/1/3/4/5/134515271/9764924.pdfIn PDF document text
    • https://suranetu.weebly.com/uploads/1/3/4/4/134458043/3818952.pdfIn PDF document text
    • https://site-1166704.mozfiles.com/files/1166704/dolmar_ps_7900_manual.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/bb427ecff126227.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405904/normal_5ffdc5aad9173.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/nunakixuma/a_clockwork_orange_full_book.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/adjectives_for_personality.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/zalipulikobi.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_off000104ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CE 5444 bytes
SHA-256: de996877a1ef4f7731aef2a98ac24e9b5458b945eea9581f1969aa6018e37845
font_01_sfnt_off0001172f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172F 10824 bytes
SHA-256: 4da7008b701960094f2871afa29f3266611c436e5650bcdb6e0e0dbc5ade7894

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