Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8a759865921e5d…

MALICIOUS

PDF

74.7 KB Created: 2021-04-25 04:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ea7741ef0c63192ed11edcd98229bb34 SHA-1: 80aa2f4ed599b2dbc281c762920daf448c8308d7 SHA-256: fc8a759865921e5db543b6f2f1d7d90ecb65185e6eb4789f43ef2c1ddaed10ef
166 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://baarspo.ru/strik?utm_term=tc+electronic+nova+system+factory+reset PDF link annotation
    • http://aarbuz.space/what_does_f01_mean_on_hisense_washing_machine86vz5.pdfIn PDF document text
    • http://localdesign.me/how_to_use_splat_lightening_bleach_decolorantq00qm.pdfIn PDF document text
    • http://rewita.fun/96808256191drv3n.pdfIn PDF document text
    • http://autobaff.xyz/fl_studio_12_full_tutorial3ffgz.pdfIn PDF document text
    • https://vogunuwar.weebly.com/uploads/1/3/4/8/134887333/ximimazuwumug.pdfIn PDF document text
    • http://nasty666.space/78191513029qsyhx.pdfIn PDF document text
    • https://sozatoma.weebly.com/uploads/1/3/4/4/134484551/famakeriwikoviw_donefuxekup.pdfIn PDF document text
    • http://ttttrrrr.space/jeneputotijadvcask.pdfIn PDF document text
    • https://nedugapepo.weebly.com/uploads/1/3/4/2/134265444/6994923.pdfIn PDF document text
    • http://kfnwejfnkwheklf.space/74628930940nzbta.pdfIn PDF document text
    • http://silvanozito.online/how_do_i_save_baby_groot_in_fortnitectu0x.pdfIn PDF document text
    • http://grafoanaliz.ru/51659918222wxeev.pdfIn PDF document text
    • https://noselokegikol.weebly.com/uploads/1/3/4/3/134347285/dapowewu.pdfIn PDF document text
    • http://chestlune.online/velodrome_track_material6k8mj.pdfIn PDF document text
    • http://idealica-tufficiale.website/61838100280uu59d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_7d523cd9fa6f47ec9f9ac7f728b3b9a1.pdf?index=trueIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_ad9dff5d371141319539ece6b9cd5e02.pdf?index=trueIn PDF document text
    • https://4a1fbaa0-0e67-401b-a466-96699e2e5642.filesusr.com/ugd/9647bf_58d165e884d742fdaf8d89683076aa05.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_off0000e75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75D 5136 bytes
SHA-256: f797e723431e26e67faf9298c42a13a7423a63babb65b1a95638a78d41b01680
font_01_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 10776 bytes
SHA-256: 8bca847c27cb074a11f7e9bf18af81a3e6203e67295b04be2e39e5de1de65771

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