Malicious PDF — malware analysis report

Static analysis result for SHA-256 01175687c7310e14…

MALICIOUS

PDF

141.6 KB Created: 2021-03-08 00:04:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1ce0b021bf9e34243f373426822d52ba SHA-1: 6bc6d7aeafe40332a37561cd709e9099025cfae3 SHA-256: 01175687c7310e14cbf98792f253eb62014dae0cc51b8d46e5e18e262b99bd0e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains a large number of external URIs pointing to disposable domains, suggesting an attempt to manipulate search engine results or distribute secondary payloads. The presence of multiple external links and the detection of a phishing/trojan PDF indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • 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://dugedepap.ru/wb?keyword=noun%20verb%20adjective%20adverb%20list%20of%20words PDF link annotation
    • http://springtea.space/818108592759ppkh.pdfIn PDF document text
    • http://nikaold.site/68355751475xa27l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461202/normal_5fdb8b25c427b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454984/normal_5fd7adf58df23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388416/normal_602345a4a98b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_6015ddb8e7234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489028/normal_603d80d656da6.pdfIn PDF document text
    • http://myshoes.moscow/mozoluferikoriwepua71ew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383464/normal_5ff1d234446e3.pdfIn PDF document text
    • http://bilkaita.space/279137759049zo5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482407/normal_600f2e3b4246b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490274/normal_600f75a9c5e7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_602861cf1957b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402717/normal_5fc9b0573a67e.pdfIn PDF document text
    • http://free-at.pro/how_to_replace_schlage_lock_cylinderjxz6b.pdfIn PDF document text
    • http://gaydating.world/angular_7_portfolio_template_freejlk07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_759cdfc82e3d4f509455360c1c0f6360.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/27949100-2e1f-404a-b6b4-7a7689b855d9/how_do_i_connect_my_canon_mg6320_printer_to_wifi.pdfIn PDF document text
    • https://ff366fda-cde0-4b3b-b256-8a43afed25ec.filesusr.com/ugd/b3318b_c5fd93872e404928876116496d0cd784.pdf?index=trueIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_c318e1737a2444dd92a12cf40d618456.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b17195b-f095-4695-a6f5-284a9b8cfa88/job_stress_scale_questionnaire.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_off0001f182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F182 5352 bytes
SHA-256: 3c6f85c1aa0c974df1f0b807e0cd51d0b1848d2e8675d23cc0aade3a66b59eb7
font_01_sfnt_off000203e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x203E1 10672 bytes
SHA-256: a24a69ffb0878cf25002f09a22a3a533761c4e4295853a6a3b1571e908208e8c