Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3d8b0f0cba7069…

MALICIOUS

PDF

78.2 KB Created: 2021-02-19 06:30:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 0ac4af7789e6960cf5458fe0cdb6e616 SHA-1: 2e49ec77eab85e3ca51fc3ba4044a8c4d8fa45ed SHA-256: df3d8b0f0cba706939625d7c815153215f85af40d96781b62c73a95c8262d163
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to contain metadata rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://crophysi.ru/aws?utm_term=nikon+d40+guide In PDF document text
    • https://cdn.sqhk.co/xekixuzurim/Zxd2Whe/vidajivopuniriguladaputeg.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/eTrGkmO/draw_duel_apk_mod.pdfIn PDF document text
    • https://roxejozojone.weebly.com/uploads/1/3/0/9/130969259/9752104.pdfIn PDF document text
    • https://nipoxumafoji.weebly.com/uploads/1/3/4/7/134717148/1014513.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/giToNaW/devexozedip.pdfIn PDF document text
    • http://avtoshtorki.shop/like_love_hate_worksheetgq6kc.pdfIn PDF document text
    • http://hook-up.fun/83330449106946hw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393020/normal_60271633ead7f.pdfIn PDF document text
    • http://sacredname.ru/importancia_de_la_comunicacion_librosbgl29.pdfIn PDF document text
    • http://easylearning.space/mifevosotukigatozijyz90h.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/edujjjd/88722147035.pdfIn PDF document text
    • https://cdn.sqhk.co/wesebewoweva/frkibgd/55043815157.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490724/normal_5ff8f21e9363d.pdfIn PDF document text
    • https://dazuvekojuj.weebly.com/uploads/1/3/4/8/134863877/pukijolu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wadafitukaleka.rf.gd/vuvesarivigugasivaf.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_off0000f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 4740 bytes
SHA-256: b8ba0c0b86beeafe20ab59da3c79ea5ddc10b2cb59e8f468c31a16e4116d6dad
font_01_sfnt_off000107c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 10728 bytes
SHA-256: c06648d9e6839835d0b3a61a0e7076142a973c175c155b564ee55b268a7db9f5

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