Malicious PDF — malware analysis report

Static analysis result for SHA-256 206607928949683f…

MALICIOUS

PDF

123.0 KB Created: 2021-03-29 13:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 56ef85886ca5b0f59ad8abca8262f6f9 SHA-1: c7a9027c00e1b632694b9cbe26e5a81ad6125664 SHA-256: 206607928949683f8c6322cd65f23044b232afceb4a0128ebbb371a5f29510c7
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The embedded content, though heavily obfuscated, appears to be a lure for users searching for specific academic material, aiming to redirect them to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • 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://pelibifir.ru/award?keyword=data+structures+and+algorithms+pdf+aho PDF link annotation
    • http://mgacessoria.online/best_orhan_pamuk_book8adc1.pdfIn PDF document text
    • https://kibodoru.weebly.com/uploads/1/3/2/6/132695707/logajuniwuse.pdfIn PDF document text
    • http://odemebayisitrafik.com/zolulisememuvoluroviesz68.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/EngdXMJ/mukafujutozavisojukugas.pdfIn PDF document text
    • https://cdn.sqhk.co/koporikog/34ijhhi/jijowulopiremurirosev.pdfIn PDF document text
    • http://copyrightram.net/spiegel_im_spiegel_sheet_music_violigqbuj.pdfIn PDF document text
    • http://mejumafegebameg.mygamesonline.org/multivariate_data_analysis_using_spss.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/najumav.pdfIn PDF document text
    • https://cdn.sqhk.co/dofofoziga/gchfHji/azadi_movie_songs_free.pdfIn PDF document text
    • http://jigapenufi.medianewsonline.com/nabuvemeweduna.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/f3bfecac82457.pdfIn PDF document text
    • https://cdn.sqhk.co/lajoroteb/kkU4shi/nigatarabuzemamaliraro.pdfIn PDF document text
    • http://a1metromovers.com/16383712521ejmsf.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/LYjhmhg/trucos_de_fifa_soccer_13_ps3.pdfIn PDF document text
    • http://gratoraama.space/unspeakableplays_intro_songgkdsd.pdfIn PDF document text
    • https://ponatuxo.weebly.com/uploads/1/3/4/5/134596183/595213.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/rutiwegopakotetomilapizar.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_off0001a39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A39D 5568 bytes
SHA-256: 2f683d61e63823878426cf57b4f5adedd728ecac186f34cd6f2933f39852ed75
font_01_sfnt_off0001b664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B664 13036 bytes
SHA-256: d11bf2008c2ab1043da3a336de3cefa3d8607d96e3eb9540cd1226ec24bf41c2

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