Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce35b6964e837441…

MALICIOUS

PDF

74.4 KB Created: 2021-02-18 12:10:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d4acbf9104fbb6e909dc820c99d7665 SHA-1: 96d00c1d37f0bbd0b9158a09c5c1fb9279373526 SHA-256: ce35b6964e8374416d03187ba064df3cadc70297f813e9c7e7cd10f102891372
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating it is likely a phishing or malware delivery document. The presence of numerous external links, including a link farm, suggests an attempt to direct users to malicious websites for credential harvesting or further payload delivery. The 'SE_MFA_LURE' heuristic specifically points to a tactic of tricking users into providing sensitive authentication information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://leonvi.ru/strik?utm_term=stock+markets+crashing+2020
    • http://probnik1313.tech/51544079045xvu8u.pdf
    • http://copytoshka.ru/hits_100._9_aruba6tj8i.pdf
    • https://wowiwega.weebly.com/uploads/1/3/1/4/131453904/dejirima.pdf
    • http://afracheat5.xyz/daniel_hart_power_electronics_chapter_2_solutionsqxm5x.pdf
    • https://xazulifego.weebly.com/uploads/1/3/4/7/134727283/wadekuzukizejuv_jokukunoku_netagujazepif_xomizutufo.pdf
    • https://dozunetad.weebly.com/uploads/1/3/4/4/134472758/mebabo.pdf
    • http://alluniversity.fun/championship_manager_apk_2018jt11d.pdf
    • https://cdn.sqhk.co/kabevapixox/lcYhbi4/77097953940.pdf
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/rosemarosenonolasuxa.pdf
    • http://fredo.bike/nurani_quran_with_bangla_translationnpw78.pdf
    • http://goossyy.online/67765019517r0arz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zizene/rupawopemukesiwokaref.pdf
    • https://s3.amazonaws.com/tiluwisulepam/kobamujupelanilimu.pdf
    • https://s3.amazonaws.com/rorives/idl_reporteros_significado.pdf
    • http://batawovajupofu.rf.gd/website_layout_design_psd_files_free.pdf
    • https://s3.amazonaws.com/wopari/android_studio_github_login.pdf
    • https://s3.amazonaws.com/sezewu/68699755706.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_off0000e31a.bin
e9944db97248e1e86b1f94d9aca63cc9ff7563698025009944f348c3066e2369		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE31A 5624 bytes
font_01_sfnt_off0000f609.bin
f7c736fc6d7902160347ebefb74c59722e928b1d9143fdfd29014c0d48746c26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 11368 bytes

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