Malicious PDF — malware analysis report

Static analysis result for SHA-256 56344ba84e4ac0ea…

MALICIOUS

PDF

80.7 KB Created: 2021-03-08 17:39:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b79635786d8957b381b00bc383635edb SHA-1: 5b5164d43f8bc2a1c47661c5551b006fe399e2b2 SHA-256: 56344ba84e4ac0eabe3cdb135283f2660b24bc2b38fca4eb61ad456973e13724
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous external URIs pointing to various domains, with a notable heuristic identifying it as a link farm on disposable hosting. The presence of embedded URLs suggests an attempt to redirect users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=brush+script+font PDF link annotation
    • http://sandiego-podcasts.com/fly_me_to_the_moon_bass_sheet_musictjhnk.pdfIn PDF document text
    • http://wwbook.org/53280781092itt5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374371/normal_6034a0c6cd6cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385214/normal_6013e75b01231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376600/normal_602795cde1e2a.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/PibjdFd/xajov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384468/normal_6008380891653.pdfIn PDF document text
    • http://viximer.iblogger.org/samsung_j200g_combination_file_free.pdfIn PDF document text
    • http://shlifovka-pol.website/26787561486va9b0.pdfIn PDF document text
    • http://kamini33.ru/rockstar_games_for_pc_freew5r11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_603754f52e3d6.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/jjd8ZZf/29367656283.pdfIn PDF document text
    • http://susurrus.space/garmin_gps_etrex_10_instructionss8neh.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/ejgbhhX/92488150973.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/RpbohbL/rap_to_beats_pro_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tujodaf.rf.gd/rime_of_the_ancient_mariner_analysis_part_3.pdfIn PDF document text
    • http://xesepodine.rf.gd/how_to_install_git_from_command_prompt.pdfIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_0318e0115a074c8a87a7a03ca89a3733.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_b6174322ee9d4c7297b1f1982daff8d2.pdf?index=trueIn PDF document text
    • http://jimanujomubil.epizy.com/bowel_cancer_screening_nz_guidelines.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_off000100bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BC 4912 bytes
SHA-256: d4a1649c16888858585f9a73de13cf21cdce4682905a2c6818214933440723c0
font_01_sfnt_off00011177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11177 10808 bytes
SHA-256: 8d5c2e728715d7a10ed94549824b5f7860dc958811332895600178a0bfb96550

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