Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d888711875dba4…

MALICIOUS

PDF

73.9 KB Created: 2021-03-06 08:30:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: fd972b39db3218afd48100571db81516 SHA-1: 23b8db13e5d2d69c9db54551ee49ae91db1d1e99 SHA-256: d1d888711875dba42bcfabec0b98fe2164ece86a03f6fd99e8f6a28f00eb0f8d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. While no scripts were explicitly extracted, the presence of numerous external URLs suggests a phishing or SEO manipulation attempt, potentially leading to further malicious content. The file's structure and link farm indicate an attempt to distribute or mask malicious activity through a large number of seemingly unrelated links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/award?keyword=all+igcse+maths+formula+pdf PDF link annotation
    • https://cdn.sqhk.co/numiwufeguv/kijkzjg/recette_sandwich_aux_oeufs_japonais.pdfIn PDF document text
    • https://cdn.sqhk.co/piwewupovo/PGdlbgg/roku_remote_not_working_blinking_light.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamewojaf/iichalU/u_mobile_prepaid_validity.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/iidhjzj/birinudenevoga.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/hfjiEnh/dakeretufevojanado.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/jjeviaV/cookie_run_coin_farming_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/9jbk93K/38277048380.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/jR7pgii/seven_letter_words_with_z_in_the_middle.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/Qiijg02/nox_android_emulator_for_windows_10_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/eNgXQmP/animal_jam_play_wild_item_codes_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://daa82c20-c2c2-4c2a-a78a-9e34c7d8fbea.filesusr.com/ugd/9c43ec_012c8a16cecd4ceba7f1f219f3b9c9c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/formation_pole_emploi_barman.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/22988752031.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/canopy_growth_earnings_report_time.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/muvozox.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/free_catalogue_design_psd.pdfIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_f35b87062f5a4dbf8c335950368d590d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fasudikek/74060484549.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/sulalatuzitaxuteki.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/mufinukusem.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/80903359852.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/83170575702.pdfIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_032cae4ba3614d389a077965edcf40ae.pdf?index=trueIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_85b9b4f3260e41a69000ae0cbb28e86f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dofufiri/32646276216.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_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 5556 bytes
SHA-256: 0fbe13a44e3e543d7d0799fe4d8b495c986736fe92fa7037b9ece23777621de8
font_01_sfnt_off0000f5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 10540 bytes
SHA-256: 9b8a45fa71b04629f9e8dce4eec4e4f6c556745baad0fba87ae8f1a0dcd4de87

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