Malicious PDF — malware analysis report

Static analysis result for SHA-256 8080b66f9b1f6f91…

MALICIOUS

PDF

98.2 KB Created: 2021-03-17 10:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 646b8db977c23671c4020d81292e5144 SHA-1: 9722e714c3c4b3ebe5d9f9144bab2723c5450901 SHA-256: 8080b66f9b1f6f91c4ef1e7a043216358acef88b9e17e69c17f54d96a84df739
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and a potential phishing or malware distribution vector. It contains a large number of external links, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=beginner%2527s+guide+to+sketching+characters+creatures+and+concepts+pdf+download PDF link annotation
    • https://resusogid.weebly.com/uploads/1/3/5/3/135346187/jisedumakagex-lefosa-vireped-xinip.pdfIn PDF document text
    • https://pafutidosuzov.weebly.com/uploads/1/3/5/9/135989867/8935049.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476564/normal_602e9a2020e6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408348/normal_5fe29942c14bf.pdfIn PDF document text
    • https://jekotufuwin.weebly.com/uploads/1/3/1/4/131406020/6739514.pdfIn PDF document text
    • https://xovawezovikax.weebly.com/uploads/1/3/0/9/130969403/naforofi_xuzojawa_bepap_karowej.pdfIn PDF document text
    • https://bagobizofenagex.weebly.com/uploads/1/3/4/7/134767931/1210388.pdfIn PDF document text
    • https://lelamibi.weebly.com/uploads/1/3/0/7/130738841/gegitiguxu-lojigipam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490529/normal_60039b148547d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501380/normal_5fd0947abcf7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491445/normal_602dfbd55cc2b.pdfIn PDF document text
    • https://totidulabi.weebly.com/uploads/1/3/1/6/131606487/4103723.pdfIn PDF document text
    • http://jijegak.22web.org/26836490362.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mebexadesojixip.rf.gd/triangle_congruence_proofs_extra_practice_worksheet_answers.pdfIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_45e48790f20b4d61ad83ab82844b6247.pdf?index=trueIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_87ac178fbb0d448c8b0963699689aa8e.pdf?index=trueIn PDF document text
    • https://0f3c41ac-de96-4ba7-a517-026d7435d592.filesusr.com/ugd/8631de_a457ebbf9ecf4b2a967456c1f194aebe.pdf?index=trueIn PDF document text
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_45a634d3bd0b4f259e9b1fd8eee1b9dd.pdf?index=trueIn PDF document text
    • http://rifobotulaw.rf.gd/pegexeduruvojekafibo.pdfIn PDF document text
    • https://a26b494c-4f54-4b9d-aaa3-e02d462d315a.filesusr.com/ugd/c6268f_c6840909eef943119c8926d429cc29ff.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001283a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283A 5540 bytes
SHA-256: 112186b89787b8af9a2327cb0dec48c98b159b4349158da6c8fed81709ea60a5
font_01_sfnt_off00013b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B25 15028 bytes
SHA-256: 45158c84a8787ce3be9478ef229ac52a263637d619f7fb0d25f5e1f0cad9128c
font_02_sfnt_off00016a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A9D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176