Malicious PDF — malware analysis report

Static analysis result for SHA-256 f017763da25fa90f…

MALICIOUS

PDF

75.4 KB Created: 2021-03-12 00:26:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cc7f590e4c5a87f6e86eb4bf840f115d SHA-1: 269ccc42065d388f2a9d203854dbeeef91c8e5db SHA-256: f017763da25fa90f005f2797fce5a27f6bbe1186b9f7d7c8db8dbab8e74f9e51
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jumiwimov.ru/strik?utm_term=how+do+you+reboot+your+fios+router PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446497/normal_5fd662e8cd268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426813/normal_601d690429fe0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_60117962ab050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424996/normal_602f1ee621738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_5fd6531520595.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366319/normal_5fcf7f9b9d927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472200/normal_5fdb24b1ce7ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369908/normal_60033636281ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492250/normal_604a9665d3458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500670/normal_5fe8e4cccca71.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/jasadavebaga/nusrat_fateh_ali_khan_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/45180461310.pdfIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_578b9c3ce5eb455aba81621c95d4dcd8.pdf?index=trueIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_8e9c6301f3254a84915785a4a0e84471.pdf?index=trueIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_1033e8703eb1459a8db94137499c2b1b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/rozaxojijagomu.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/23766485518.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/puxixinamejo.pdfIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_f490d2d0bc9a4c66bb2c065bc180979b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/12527760901.pdfIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_c3d2302cb4f7486fae9915b320236ce8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/penale/31125529347.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/geomorphology_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/44364152299.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_off0000eb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB26 4952 bytes
SHA-256: bf88974f5c8d2b4e81005daf4e64d7d29d6e43f41bb331cb1552d95e09566b68
font_01_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 10492 bytes
SHA-256: b8244190731afd0018e66b4f024267142f05b3cad4e68c2ab145813e468d3f97

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