Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9789bd682dc1e52…

MALICIOUS

PDF

82.7 KB Created: 2021-04-05 21:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6aa389f376650f9f31a0b5b162d5591 SHA-1: 5c62da82906d0ca8ad9b5993d87fac94b70e2241 SHA-256: e9789bd682dc1e524758201f9ac0d53160ea5134764de792466fc8fc58e5d8df
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to suspicious domains, indicative of a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SUSPICIOUS_LINK_LURE' strongly suggest malicious intent, likely to redirect users to malicious websites for further exploitation or credential harvesting. Although no scripts were explicitly extracted, the PDF structure and numerous external links are commonly used to deliver malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://jumiwimov.ru/award?keyword=sociology+dictionary+for+upsc+pdf
    • https://xirozakopep.weebly.com/uploads/1/3/4/7/134719339/kukolagik.pdf
    • https://cdn.sqhk.co/zonakagud/ieChhAJ/75535964204.pdf
    • https://bixagitiwor.weebly.com/uploads/1/3/4/6/134618264/9089292.pdf
    • http://lovepositions.info/48583584338asucf.pdf
    • https://fitovaturi.weebly.com/uploads/1/3/4/3/134371738/bojimudib-towowelus.pdf
    • https://cdn.sqhk.co/dijogiper/fiexihf/28949335913.pdf
    • https://kerumesuni.weebly.com/uploads/1/3/4/1/134131613/84ee21875fa39.pdf
    • http://marketop.club/bozuwixuzifejavesebegimut68cnu.pdf
    • https://cdn.sqhk.co/torevebeti/gghdjig/bsc_agriculture_online_form_2018.pdf
    • https://cdn.sqhk.co/pusobatosip/ghhfhhX/lolilijeburan.pdf
    • https://nojokuvevufig.weebly.com/uploads/1/3/4/1/134109253/2028414.pdf
    • https://vedalamiru.weebly.com/uploads/1/3/0/7/130776143/kokujagoteb.pdf
    • http://naturka.space/aratiles_as_cure_for_diabetes81iqj.pdf
    • https://kesevure.weebly.com/uploads/1/3/4/4/134497963/nopoxijino.pdf
    • https://kovapuneluwaze.weebly.com/uploads/1/3/2/3/132302913/7bf71987.pdf
    • https://cdn.sqhk.co/zanaforare/1TeTge6/rank_one_forms_yisd.pdf
    • http://jaxagogilexet.sportsontheweb.net/the_squat_bible_download.pdf
    • http://clubstore.pro/24457916404hoyi.pdf
    • https://cdn.sqhk.co/dugixikisim/dgfjjlp/bibuxowowumalobapagizaku.pdf
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/kenivemozofo.pdf
    • http://securityofusersdevicesonline.site/nikon_coolscan_v_ed_driver_for_macfc0tp.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kavuduvolilazod.myartsonline.com/sepsis_icd_10_guidelines.pdf
    • http://mujebik.atwebpages.com/zatadusixopezupugi.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_off00010547.bin
2829096fe7942784c9e2b2d7e5ecba65194b47824f339babb6b5fd7495af966e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10547 5528 bytes
font_01_sfnt_off0001182a.bin
799259544f18544b775c6c7122225873374641c49a4d7958c45f37c8384ff46f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1182A 10848 bytes

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