Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c35d91176539945…

MALICIOUS

PDF

74.6 KB Created: 2021-03-16 13:10:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9eaf981804174e0445af10490fd1f987 SHA-1: e8784046786c1a969d83ec9fbd25064e40ae8826 SHA-256: 0c35d9117653994571bbfce264c99620eb42a0e2295fcbf91ab0834a3fe72ecb
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' pointing to 30 external PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the presence of embedded URLs and the 'PDF_SEO_LINK_FARM' heuristic suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/123?utm_term=abdominal+aortic+aneurysm+guidelines+canada PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380522/normal_5fcbd2a1f26b5.pdfIn PDF document text
    • https://tilivugex.weebly.com/uploads/1/3/4/1/134108965/juwapisamija.pdfIn PDF document text
    • https://cdn.sqhk.co/nanijamu/F0afjiA/florida_agritourism_guide.pdfIn PDF document text
    • https://wojawodexof.weebly.com/uploads/1/3/4/6/134673733/6128d9ffd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485440/normal_60403190730ea.pdfIn PDF document text
    • https://cdn.sqhk.co/fagevibe/5aic0pa/song_lollipop_lagelu_new_version.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/dixaleko/keto_zone_diet_don_colbert.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/73180718775.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/full_marks_guide_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa798464-b796-4073-b047-54fb6ebae303/xerisikedarofip.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/enflow_blood_warmer_service_manual.pdfIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_ecc5bdb06a1a4d4a85a28d485d9bec67.pdf?index=trueIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_67d34aae6f1e4727932d609c86323738.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc1ef11-e87a-47f0-a44c-f35a5ac15165/how_to_use_only_spin_in_lg_top_load_washing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/096f1a33-ef7c-4269-bc73-5c3a9b6b4280/olympus_om2_spot_program_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c515e46-a0df-4b84-8eb8-8412ed193c38/marlin_336ss_lever-action_rifle.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/video_editor_music_cut_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1045b2b-8d5c-4bac-b635-fbe2e13c0a23/how_to_use_arbonne_shakes.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_off0000e6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BC 5492 bytes
SHA-256: 392ff9982a85b709f66446d4c927efd2af3a0c9d5e547cc9b2e41dd3cac6e10c
font_01_sfnt_off0000f953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF953 10412 bytes
SHA-256: 35ff7f554fefe8f2d2532ea8458bbf1b36a34ac96c9dff82731394061270be20

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