Malicious PDF — malware analysis report

Static analysis result for SHA-256 904022ebd9f6df88…

MALICIOUS

PDF

172.8 KB Created: 2021-03-20 13:19:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c58fb728e11445969e95839042387ec6 SHA-1: c31ded12fbb964ac912c8a385b925e3b84b5ec58 SHA-256: 904022ebd9f6df8887cbc4a6e428a7a1e52ebf7811cc7e07534141253ec00544
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document attempts to trick the user into executing commands, likely to download and run a second-stage payload. The presence of embedded URLs, such as 'https://ponafet.ru/award?keyword=advanced+life+support+textbook+pdf', suggests a phishing or credential harvesting attempt. No scripts were extracted from this sample, but the overall behavior points to a downloader or dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9711

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://ponafet.ru/award?keyword=advanced+life+support+textbook+pdf PDF link annotation
    • https://rizipopene.weebly.com/uploads/1/3/5/3/135316145/2b4c3216983f86b.pdfIn PDF document text
    • https://diveziriluro.weebly.com/uploads/1/3/4/4/134447321/jajigotozem-wizakozixuguk.pdfIn PDF document text
    • https://cdn.sqhk.co/winogolelog/fiia9ah/best_fps_games_for_ps4_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/7jbkMja/81661070759.pdfIn PDF document text
    • https://pegavuvusejeda.weebly.com/uploads/1/3/1/4/131483027/nadulejan_xuvipab.pdfIn PDF document text
    • https://cdn.sqhk.co/sifomujotaxa/fJihnid/15606481789.pdfIn PDF document text
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/bf1a17be285.pdfIn PDF document text
    • https://jutineriru.weebly.com/uploads/1/3/4/8/134866815/8b9438791.pdfIn PDF document text
    • http://tefituguj.iblogger.org/61144298424.pdfIn PDF document text
    • https://bexubefobex.weebly.com/uploads/1/3/4/4/134476762/kisetofopugufef.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/yha4jjq/national_rowing_championships_2019_results.pdfIn PDF document text
    • https://cdn.sqhk.co/xolizoxime/Mhgjgnb/kundali_bhagya_episode_mp4.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/hd5JFyM/the_university_of_hong_kong.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/gKxij7w/bmx_balance_bike_costco.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/fgiKlja/attachment_report_for_procurement_students.pdfIn PDF document text
    • https://cdn.sqhk.co/xidizizo/hdZRiex/report_copyright_infringement_on_etsy.pdfIn PDF document text
    • https://direwuberegenis.weebly.com/uploads/1/3/4/3/134361890/fikisupelupu.pdfIn PDF document text
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/2191a.pdfIn PDF document text
    • https://nunibuzobaga.weebly.com/uploads/1/3/0/7/130740367/df1a0ab.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pasexojubil.epizy.com/balloon_tamil_film_free.pdfIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_465224d78f6e4576838bd791fee11605.pdf?index=trueIn PDF document text
    • http://panadokopejed.epizy.com/ganipugevelixezudetiwu.pdfIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_88d0af70a49342a1bb15fee0a11cdcf1.pdf?index=trueIn PDF document text
    • http://xujalebarot.epizy.com/jelupeziziza.pdfIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_f6cd00ec3a4e4741a029870fe1b603ed.pdf?index=trueIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_ee2ba469ed5f41d482363cc74dd2f303.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24438 2376 bytes
SHA-256: fe50f6f3f965abe51995c1c9b0f12557426edbc3628e2441a02ef8886cae1b61
font_01_sfnt_off00024ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24EC0 5472 bytes
SHA-256: 053836fae6e0c37311774b1d8ec6010f21259df704a7d3b48a128b19fc0b6d45
font_02_sfnt_off00026176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26176 13176 bytes
SHA-256: 8f704d78b4aee6bdd90855362306cc3fa8566562c540e4fca20df12489259c56
font_03_sfnt_off00028e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28E7C 16132 bytes
SHA-256: e1c0be1f083949b69301fca371b50a13b2e5d6d7a534d85b46ff30d714689a59

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