Malicious PDF — malware analysis report

Static analysis result for SHA-256 4251a5daa085be92…

MALICIOUS

PDF

84.7 KB Created: 2021-03-30 22:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 315a02b3b48f51c168514186b4a31b7b SHA-1: ebb89aae36ac072c1cbe77a0c3ad80ecb7e25833 SHA-256: 4251a5daa085be92f10a5170bdf92047dfa58a3ab47ef0f9a8292bd4e99d37f9
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a large 'link farm' with numerous external URLs, including one pointing to 'mezovuduw.ru', suggests a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and extensive external links are indicative of an attempt to lure users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=flipped+novel+pdf+wendelin+van+draanen
    • https://cdn-cms.f-static.net/uploads/4412897/normal_602b4cb2db9b4.pdf
    • https://pejoguroboxifuj.weebly.com/uploads/1/3/1/6/131637830/fopipeduxafona-tewowawudine-lapumovujikoda.pdf
    • http://copyright-notice-ig.com/focusrite_scarlett_2i4_2nd_gen_user_manualav0zl.pdf
    • https://cdn-cms.f-static.net/uploads/4410013/normal_6054b7a66e6fa.pdf
    • http://nakodinita.scienceontheweb.net/manalirovegevuforeziv.pdf
    • http://kawlites.online/505027568249hx32.pdf
    • http://bizowokare.getenjoyment.net/boy_baby_names_in_tamil_2020_download.pdf
    • https://cdn-cms.f-static.net/uploads/4472481/normal_60274b978c60f.pdf
    • https://cdn-cms.f-static.net/uploads/4465392/normal_605ad939384b4.pdf
    • https://cdn-cms.f-static.net/uploads/4483338/normal_605172ad05b1c.pdf
    • http://suvolupijiro.mygamesonline.org/42479731456.pdf
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/2955cfde3e08d43.pdf
    • https://static.s123-cdn-static.com/uploads/4497078/normal_5ff0012f5c66b.pdf
    • http://odemebayisitrafik.com/netflix_apk_para_android_9k8q0k.pdf
    • https://cdn-cms.f-static.net/uploads/4455660/normal_6032772f9c7a3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sisufovofow.atwebpages.com/77904911405.pdf
    • http://bigapenegig.atwebpages.com/momegabitob.pdf
    • http://kifesafijupesob.onlinewebshop.net/allahabad_high_court_judgement_on_ram_mandir.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f639.bin
883f4aa24af8b7375845fd33252ed3297b9617bbbc350ed1fe93136b5fa35029		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 4964 bytes
font_01_sfnt_off0001074c.bin
dc3cd274eb8ce081c3bedd9aafda39ee19999c0b83306594b52b9203a0f8d82c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1074C 11176 bytes
font_02_sfnt_off00012db3.bin
bebbc274d67dfb08320664af05e991d51a62f3da21d3a59bcc15ce7f3782c3a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB3 16692 bytes

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