Malicious PDF — malware analysis report

Static analysis result for SHA-256 d805a144e5ae2222…

MALICIOUS

PDF

73.9 KB Created: 2021-02-03 20:47:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d01a1eb9ffc084b6c4b352a4d9bb86d6 SHA-1: f42a1ed1caaa6977cbadc945570c9b4a3f0467b1 SHA-256: d805a144e5ae2222738c4fcd4c197ffb00b9b3118dfc3a2ffe0d79e8466abcb6
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to host a large number of external links, likely for SEO manipulation or malware distribution. One of the embedded URLs, 'https://maypoin.ru/123?utm_term=mayan+calendar+translator', appears to be a lure for users interested in Mayan calendars, which is then used to redirect to potentially malicious content.

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://maypoin.ru/123?utm_term=mayan+calendar+translator
    • http://nosinoski.shop/98005984382mz9r2.pdf
    • https://vezefujofebiv.weebly.com/uploads/1/3/5/3/135304234/768c3d.pdf
    • http://inostrana.com/xezozenajekidibewumekjx2dm.pdf
    • http://cupe1.ru/a_study_of_tungs_acupuncture1t0c6.pdf
    • http://remontlegko.info/swedish_alphabetp7ev8.pdf
    • http://alkim.xyz/kimotovoxuzasuvosifusotrll.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vonutavekip/84532153160.pdf
    • http://ziboporo.epizy.com/battlelog_battlefield_2.pdf
    • https://s3.amazonaws.com/xovajukoxin/attendance_certificate_form.pdf
    • http://tawosowi.epizy.com/roti_chapati_nutritional_information.pdf
    • https://s3.amazonaws.com/kalanejaxutilif/wexalifajadavib.pdf
    • https://s3.amazonaws.com/zagubip/baxojufubuzawagarananet.pdf
    • https://s3.amazonaws.com/winumigutam/android_tv_remote_desktop.pdf
    • http://baxodivol.rf.gd/johnson_and_johnson_sustainability_report.pdf
    • https://s3.amazonaws.com/fuwenoxuzasila/47805546868.pdf
    • https://s3.amazonaws.com/davubewu/gsma_intelligence_2018_report.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4df.bin
0b15a670660be40f585141c5fb7c77df642152d25c91bdeb4cf6bd0ed8a93544		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DF 5040 bytes
font_01_sfnt_off0000f622.bin
f468d8ab973cd2a1099fa264a8573e6340ec3fbb06561f2a9224240d2979ac30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 10784 bytes

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