Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd78d7b4e6c066d7…

MALICIOUS

PDF

77.5 KB Created: 2021-04-04 20:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b1d6aa55fe05654f2f17deb05b621529 SHA-1: bace7dd1b24b62f78f72dd1e1341725fc6a6f3b1 SHA-256: dd78d7b4e6c066d720df4034a0844eb2edbe1ba6f6df456ac4990206ca33a8d7
126 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to a broken Elkay drinking fountain bottle filler, likely a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=elkay+drinking+fountain+bottle+filler+not+working PDF link annotation
    • http://wonuwomola.iblogger.org/english_grammar_past_participle.pdfIn PDF document text
    • http://astrology-personal.online/wavoxuxctay.pdfIn PDF document text
    • http://bullbananavannaone.xyz/lenovo_t420_laptop_drivers_for_windows_7_32_bitkhhle.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/golejifukefalusoj.pdfIn PDF document text
    • http://xenejesujotolud.mypressonline.com/belajar_bahasa_jawi.pdfIn PDF document text
    • http://shopsupergood.site/clean_repost_for_instagram_free_download7idji.pdfIn PDF document text
    • http://bonboxstudio.com/animated_emojis_for_androidqmuwb.pdfIn PDF document text
    • http://naderuromopuru.22web.org/tropical_summer_party_flyer_template_free.pdfIn PDF document text
    • http://merovew.xyz/kevujusobiwogikezegy5ti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4e96b7f-a84c-41af-beb2-762ba24ddb12/jipuz.pdfIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_e4e49980d48b425ebcf3f53c077f9d54.pdf?index=trueIn PDF document text
    • http://wufikemofumop.atwebpages.com/33300831730.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_d041a92cf9a64f99bedb395d736a328f.pdf?index=trueIn PDF document text
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_1cd2973053d14f3f8e0be30000d517bf.pdf?index=trueIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_351b3a38cb944fd09b081538f00db2ce.pdf?index=trueIn PDF document text
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_1eff92c3ffbe4fab9085bb0108fee775.pdf?index=trueIn PDF document text
    • http://giwolexuki.rf.gd/99784010585.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1af8e94-6980-4302-bd42-17289ce391d7/kowopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16ebe7b7-c603-4c97-92d1-c39f0a0883b2/44221432365.pdfIn PDF document text
    • https://591379ed-26d0-4405-baa7-5b8dadede013.filesusr.com/ugd/866ffa_d4718ad719954312863563a4092f4087.pdf?index=trueIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_4743d673cab74624ad614fd0c1120ed9.pdf?index=trueIn 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_off0000ee6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6A 5252 bytes
SHA-256: 446540249751cda339ebf3af66d60d407722ee89390954cdd5c6f0d08787c6d8
font_01_sfnt_off00010077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 10976 bytes
SHA-256: a289dae34ff7b02fb4298e0edcdba9b869dac9b3fb3ed5c41746af3800c731bf

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