Malicious PDF — malware analysis report

Static analysis result for SHA-256 8633b64b27b981e7…

MALICIOUS

PDF

78.3 KB Created: 2021-03-24 00:02:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1dba2630bd254e7b033c3ae692c9a153 SHA-1: a024043361be14394c90aed4714e8e4888367d02 SHA-256: 8633b64b27b981e751666aa9797aecb88bcb4af478ecd14b4fb2c7e8fd2fcc84
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or suspicious domains, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL that appears to be a lure for users to download further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://botokaw.ru/award?keyword=more+than+allegory+pdf PDF link annotation
    • https://luwojasog.weebly.com/uploads/1/3/1/3/131380471/7556352.pdfIn PDF document text
    • https://cdn.sqhk.co/vofosutuwo/Hgi0P8w/toggle_translation_spanish_to_english.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/fjjXfha/kozixekalipixunuwadap.pdfIn PDF document text
    • http://beremoter.online/momukanagaxinazrn.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvatagukas/iicgcgc/66310011528.pdfIn PDF document text
    • https://cdn.sqhk.co/xogodapap/jjjhhJR/91853846475.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/93853045965.pdfIn PDF document text
    • http://vuwiwetidajin.mywebcommunity.org/15077816860.pdfIn PDF document text
    • https://bavamelamasol.weebly.com/uploads/1/3/4/7/134714994/lomev.pdfIn PDF document text
    • http://profer-opt.ru/462650770747nj5j.pdfIn PDF document text
    • http://fishland.store/81245613945yncsm.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/nototuxi_roris_xefitalodir_sowuzunomusa.pdfIn PDF document text
    • http://ita-bio.fun/bollywood_new_movie_mp4_hdcqjcr.pdfIn PDF document text
    • http://drnextact.xyz/tanhaiyan_barun_sobti_songi60lf.pdfIn PDF document text
    • http://arboozfilm.com/sozirimepar8ve.pdfIn PDF document text
    • http://domainlimax.xyz/gujirususagowumukuvatabo4ervv.pdfIn PDF document text
    • http://klokisik.space/nezanujugagob8lid.pdfIn PDF document text
    • http://vadosixajobirug.mygamesonline.org/fallout_4_bobblehead_stand_mod.pdfIn PDF document text
    • http://sewonmedix.ru/sims_3_cc_folder685uu.pdfIn PDF document text
    • http://jofipifemu.medianewsonline.com/plastic_waste_management_project.pdfIn PDF document text
    • https://jefamozalubibul.weebly.com/uploads/1/3/1/4/131438275/59b45335e5b02.pdfIn PDF document text
    • http://com-copyrighit.com/sarixiritezozukorutuweszltx5.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/Wihgju4/loft_store_near_me_now.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_e1c2053bd6d44ab8b2c8eec2c5bc8356.pdf?index=trueIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_537513f923ea4288b5a26b1ad7c17d8e.pdf?index=trueIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_ac445d84c84949e9848e124ecfe0d437.pdf?index=trueIn 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_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 5232 bytes
SHA-256: 6bf70b9bfc0c168b873e1c8f07cacc53817161a3bd0b3bc5f8bde5b48b99f9a3
font_01_sfnt_off000106d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 10784 bytes
SHA-256: 93587165ab27670142a67087f283c8634c41f0b6b0953ef98b26df48fd8f6e9a

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