Malicious PDF — malware analysis report

Static analysis result for SHA-256 1876cdf944c1ef85…

MALICIOUS

PDF

77.9 KB Created: 2021-01-15 01:21:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c09a6326d2835af45f327701211f51be SHA-1: 7081583227babab66ea939b678d9b64cbceae8cb SHA-256: 1876cdf944c1ef850530805443f5dfc3d1392d1262d69de01886e73c7e341cc1
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection further support its malicious nature, indicating it likely serves as a lure to phishing or malware distribution sites.

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://traffking.ru/aws?utm_term=variador+allen+bradley+powerflex+525+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481420/normal_5fbd358a9e66f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444643/normal_5fd89a56dfdc7.pdfIn PDF document text
    • https://lulapusorifat.weebly.com/uploads/1/3/1/4/131436971/pitevigekofesizudesa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427821/normal_5fe662dd36a27.pdfIn PDF document text
    • https://site-1178687.mozfiles.com/files/1178687/jerewupatonotewisu.pdfIn PDF document text
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/6618457.pdfIn PDF document text
    • https://site-1245455.mozfiles.com/files/1245455/wozogikejiza.pdfIn PDF document text
    • https://site-1171522.mozfiles.com/files/1171522/ffx-_2_aeon_cup_guide.pdfIn PDF document text
    • https://site-1174506.mozfiles.com/files/1174506/wallpaper_among_us_blue.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365606/normal_5fcce4a047ba9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407989/normal_5fb8ee74cb381.pdfIn PDF document text
    • https://site-1172123.mozfiles.com/files/1172123/vugoridobosokidaxolatof.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/jakujakula/voboxosufituzusuzizon.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_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 5480 bytes
SHA-256: 983639f4d695bdae13a3bf8efbb689e8a2be6eacedb64dd673ebc3346fe8ce6a
font_01_sfnt_off0001021d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 12212 bytes
SHA-256: 247908d605ed7cd50a176e4354316043ed20d182cb3ccc2338020e6827db69d9

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