Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9ef75bbfd191d5…

MALICIOUS

PDF

95.0 KB Created: 2021-03-29 10:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10f142674295a06318f0bdfb7b08c804 SHA-1: 7e5d3508cecbf5f2077a96dc24474406afdbcacf SHA-256: cb9ef75bbfd191d51db10e560c01b35daae27746a394c5f04bd24a1d553161cb
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for an external URI pointing to a suspicious domain, which is also listed as an IOC. The PDF also contains a large number of external links, suggesting a link farm or SEO spamming attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=if+you+should+lose+me+lyrics+lil+rob
    • https://cdn-cms.f-static.net/uploads/4452850/normal_605025b9d69c8.pdf
    • https://static.s123-cdn-static.com/uploads/4420039/normal_5fe0719ff3749.pdf
    • https://cdn.sqhk.co/fufowomusixi/cA8jiHZ/wakaritukixivazofol.pdf
    • https://nigerizebamogut.weebly.com/uploads/1/3/4/5/134596745/bizavadukixu_gizawubewupoki.pdf
    • https://cdn.sqhk.co/kuwusemob/qCyRcJP/fdic_call_report_glossary.pdf
    • https://cdn.sqhk.co/purizepore/geugdgj/2570931467.pdf
    • https://bafosuronam.weebly.com/uploads/1/3/0/7/130738527/8c13e.pdf
    • https://cdn.sqhk.co/zarejesorufo/S30ieOn/6284839209.pdf
    • https://cdn.sqhk.co/vagewovupug/jjFPgie/pimanuvipuzevado.pdf
    • https://sejusidanixaj.weebly.com/uploads/1/3/4/3/134374441/mibebudora_pijuz.pdf
    • https://cdn.sqhk.co/guzikiku/jgcqlZc/human_gangs_epic_battle_simulator_mod_apk.pdf
    • https://cdn.sqhk.co/xewasejeve/eicVYhc/vikings_football_game_today.pdf
    • https://static.s123-cdn-static.com/uploads/4464702/normal_6005750e8a72a.pdf
    • https://gugivubur.weebly.com/uploads/1/3/4/3/134390132/b668e49683.pdf
    • https://cdn.sqhk.co/wokupogogote/Hghgwhj/muxisu.pdf
    • https://cdn.sqhk.co/xizefonuma/ygg8j8a/voice_recorder_for_windows_7_32_bit.pdf
    • https://cdn-cms.f-static.net/uploads/4488581/normal_603fd40f3c429.pdf
    • https://cdn-cms.f-static.net/uploads/4470836/normal_603f34423c65d.pdf
    • https://cdn.sqhk.co/puxolika/vSahh0i/52575425446.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sofidubanelen.epizy.com/grammy_awards_2019.pdf
    • http://webomojewudel.epizy.com/bob_revolution_flex.pdf
    • http://govatojajij.epizy.com/a_evoluo_de_calpurnia_tate.pdf
    • http://bolapapuziku.epizy.com/84364336014.pdf
    • http://kavunuses.epizy.com/87132954864.pdf
    • http://ruwopepifip.rf.gd/niwafafol.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_off00013622.bin
ade23298b5ba55fb593ee83da073ce4a2cd2b856994134646b4ba70a5a654e5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13622 5232 bytes
font_01_sfnt_off000147d0.bin
e87b39406e2ddb7761c49b916d6f2f280491c0d56405ddd139891aaff9b7de6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147D0 11684 bytes

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