Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a9385528313469…

MALICIOUS

PDF

71.0 KB Created: 2021-03-01 11:20:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 285cd57d5bcbc4444717d05854593bb7 SHA-1: eb575dc851c4ce50d957bae8d88896969dcacb78 SHA-256: 23a93855283134694a522c4e671ab5f25a7ba056465ed44324e464cd55e514be
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing operation. One prominent URL, https://mezovuduw.ru/123?utm_term=site+planning+and+design+handbook+second+edition, appears to be the primary lure, disguised as a handbook.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/123?utm_term=site+planning+and+design+handbook+second+edition PDF link annotation
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/1779510.pdfIn PDF document text
    • https://jugotogosef.weebly.com/uploads/1/3/0/8/130814460/4046753.pdfIn PDF document text
    • https://judadumoxa.weebly.com/uploads/1/3/4/7/134718892/8474222.pdfIn PDF document text
    • https://mikugixu.weebly.com/uploads/1/3/1/4/131438693/1ff3d9a7108e0dc.pdfIn PDF document text
    • https://zexejofamimow.weebly.com/uploads/1/3/1/4/131438337/fepokoka_dibexejunapid_kekereredu.pdfIn PDF document text
    • https://bewepuxajijasi.weebly.com/uploads/1/3/4/3/134362307/penaseniwijidububo.pdfIn PDF document text
    • https://fikanofuzak.weebly.com/uploads/1/3/1/4/131438747/e3397884.pdfIn PDF document text
    • https://tozafutesaf.weebly.com/uploads/1/3/4/9/134900259/xulejeti.pdfIn PDF document text
    • https://cdn.sqhk.co/godanalumado/Bihhcjf/avenger_xtc_hardtop.pdfIn PDF document text
    • https://dutizadip.weebly.com/uploads/1/3/4/8/134889078/5938281.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/idqgehb/stormfall_saga_of_survival_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/1jjvjfw/fatet.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/ragejufa/youth_league_cup_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/ray_bradbury_the_veldt_read_online.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/guided_talk_down_deep_sleep.pdfIn PDF document text
    • http://xaboduvipil.epizy.com/temerodugewaliwifiza.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/bluetooth_for_windows_7_64_bit.pdfIn PDF document text
    • http://fididebezewigex.epizy.com/best_android_bluetooth_obd2_scanner.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_off0000d70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70E 5548 bytes
SHA-256: 4da64be5997dda54b722a6999c47d7bef4756d5d6325ca76d60387bad47e69ed
font_01_sfnt_off0000e9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E0 10816 bytes
SHA-256: f9ef5a9f4be1c949e63a75af6062c50db87b5a838e6adcb52aedd1b528c68487

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