Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7b727dfc9b3db8…

MALICIOUS

PDF

60.0 KB Created: 2020-11-20 01:33:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 20791112cfa0f216d6a5c054921123bf SHA-1: 16a0147abd66aee9f50336e8fc0bd761595e86f4 SHA-256: ed7b727dfc9b3db899de2249e02778d00c3f1726fa85cbe9d0b4cd562b4fe11f
244 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains a significant number of embedded URLs pointing to link farms hosted on disposable domains. One critical heuristic indicates the PDF links to known malicious redirector infrastructure. The presence of numerous links suggests an attempt to direct users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gettraff.ru/strik?utm_term=color+and+light+pdf In PDF document text
    • https://rozenawaxu.weebly.com/uploads/1/3/4/5/134517597/tesudavapa.pdfIn PDF document text
    • https://xuwotuzuzebim.weebly.com/uploads/1/3/4/6/134620597/6a29ec54b15f.pdfIn PDF document text
    • https://zunesevofulopu.weebly.com/uploads/1/3/4/3/134385883/c6d5792188256a.pdfIn PDF document text
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/tojinorudise-futujigogiraji-pisoziwanis.pdfIn PDF document text
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/7396319.pdfIn PDF document text
    • https://kifugezob.weebly.com/uploads/1/3/4/5/134529667/8b854e6562e51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383695/normal_5f95c2739e459.pdfIn PDF document text
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/aa532ed40355021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f8bf9d733495.pdfIn PDF document text
    • https://xameramavojipav.weebly.com/uploads/1/3/4/2/134265998/goledaxetego.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/gaguxisomi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cdb4dd1-5c8f-40fc-b470-0aa6b76c49f5/zodufabizokasilakipuku.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/red_lobster_nutrition_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/93370827908.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_off0000b253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB253 5028 bytes
SHA-256: 8def68cb8094619d0293dd833c6138f142dc6de013381eac73fec896ccf99f19
font_01_sfnt_off0000c365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC365 9452 bytes
SHA-256: fcaeb0042c5111ea307b4fedfe3b9ceff7b69a49ae78472b8f38e83460f4fbf4

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