Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa95cdfc169410c…

MALICIOUS

PDF

84.5 KB Created: 2021-03-13 21:29:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8620484266794b5c412398b605ee544a SHA-1: 293ac3b79c9565e6c9fa6f977bfcb051da4000c7 SHA-256: 1aa95cdfc169410c3e2bc325d01741affe2adb5b972764902059d22e6c9529bf
244 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, functioning as a link farm. One of these URLs, 'https://crophysi.ru/award?keyword=introduction+to+automata+theory+john+e+hopcroft+pdf', is identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://crophysi.ru/award?keyword=introduction+to+automata+theory+john+e+hopcroft+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_60340ea2c89b3.pdfIn PDF document text
    • https://dujomimip.weebly.com/uploads/1/3/6/0/136086420/kovum.pdfIn PDF document text
    • https://fedonofawok.weebly.com/uploads/1/3/4/8/134881994/lubewetukum_lojetadenogol_tavapemo.pdfIn PDF document text
    • https://lizuxafemow.weebly.com/uploads/1/3/0/7/130776517/8b9ea8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_5fd619c053b1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416490/normal_60383544933ae.pdfIn PDF document text
    • https://miniroworopan.weebly.com/uploads/1/3/4/4/134444940/wevuzavujukubi-pibibijexonowe-wedetugop.pdfIn PDF document text
    • https://babuluvenan.weebly.com/uploads/1/3/0/7/130739113/jisumoxev_gokovonif.pdfIn PDF document text
    • https://nuvosukive.weebly.com/uploads/1/3/4/7/134718285/silif-jujetenipebuxi-pabepanawiru.pdfIn PDF document text
    • https://vopupina.weebly.com/uploads/1/3/1/0/131070761/tiseredodilibapime.pdfIn PDF document text
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/3478772.pdfIn PDF document text
    • https://bebamewikirebu.weebly.com/uploads/1/3/0/8/130874540/mikorarobolovu.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
    • https://s3.amazonaws.com/vavapekadoliti/short_answer_study_guide_questions_to_kill_a_mockingbird_chapters_4-7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/461c2ea3-e317-4324-8a68-5020f2b49417/76462382249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa7252f0-1918-4277-99b7-da2a475621b0/what_is_the_a1c_range_for_type_two_diabetes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ab04a01-35db-480f-9aa0-6b57547d3216/thomas_calculus_9th_edition_solution_manual_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b188982-ef35-455d-90aa-cea62bb30e18/76594553504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36eff231-8f5a-48fb-9939-bcfbe107e159/96514036234.pdfIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_f7e44848f7574dce9f90ad1c28e781ec.pdf?index=trueIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_92c4ffa1d91e4f7ca8bea1a844097b0a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dalava/powakebarokamikowemegavex.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 5180 bytes
SHA-256: ca33bd015cfd10317dc10a23b8c2f0de773f01805f05c9a78d8c80e9ffae6d46
font_01_sfnt_off00010e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9C 11552 bytes
SHA-256: 3297c66bfb5f59fc9efa6448a4535fbe8091ed07654c1c540ee253040bc0a807
font_02_sfnt_off000135d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D6 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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