Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c68068daf11e4fb…

MALICIOUS

PDF

95.1 KB Created: 2021-03-21 00:00:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9a3540e437755b2b757c010a84b18c7b SHA-1: e6351345356c5c596098ac31b3e5e3ac336a0c1f SHA-256: 4c68068daf11e4fb62513bf74d1844ef0f57b7421fdfdb0853dcdeb48cd8ebe1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • 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/strik?utm_term=cognitive+bias+codex+poster+pdf PDF link annotation
    • http://dkshlyap.ru/2228288017sf36z.pdfIn PDF document text
    • http://trylait.pro/530136784280ed8o.pdfIn PDF document text
    • http://expressvpn.store/84247496700ybyyc.pdfIn PDF document text
    • http://geguxejap.22web.org/big_data_black_book_dreamtech_free_download.pdfIn PDF document text
    • http://idealslimitaly.site/6811458449649zct.pdfIn PDF document text
    • http://civiliscmq.online/pagudagusawafaronopopewxfi7o.pdfIn PDF document text
    • http://talenunuvowa.iblogger.org/upsc_zoology_toppers_notes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_f3927be206d4439e90e21c0463f7ca42.pdf?index=trueIn PDF document text
    • http://neluxiv.rf.gd/daramugopubuse.pdfIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_9bdd8f1d73f14601a08663b382415473.pdf?index=trueIn PDF document text
    • http://xaxeziru.epizy.com/lufatemekevew.pdfIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_b861e5d4d5fb4c65b8adbde291b05214.pdf?index=trueIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_9558a7f548c94565bf7cfa8788f8bd1a.pdf?index=trueIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_506bbfa0e7c34851b5cac07ac247fd59.pdf?index=trueIn PDF document text
    • http://vodipofasofuf.rf.gd/43548913456.pdfIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/apache_flume_user_guide.pdfIn PDF document text
    • https://da25564d-e3c2-4b9b-87ba-dd8ce2ae78d4.filesusr.com/ugd/c82cd6_b8a1a51acbd74c21afad0a7948808fd2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/aws_lambda_function_environment_variables_cloudformation.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_b740d389ced44ee58b028ca4bcb2a839.pdf?index=trueIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_4a9a5c304446435eadcca56d8feba46d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazomo/95763457436.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/52238870593.pdfIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_f48b7dfc118c4a2aa0ed4cac7342936a.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD40 6976 bytes
SHA-256: 2857da0107d51f1b3f87145794bc46a82b84380e011691249534e72d64ff2c89
font_01_sfnt_off00010f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F01 5464 bytes
SHA-256: d7fe62af5b52e7a52e65d67dba3853b75891863b83af3b6bb958c91997c71b89
font_02_sfnt_off000121a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A1 5300 bytes
SHA-256: 48d47a5e6acb782b2c515ed7dab0b4b98a662842661c01e3959149b4d52dce9d
font_03_sfnt_off0001346d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346D 10760 bytes
SHA-256: b91ce09752beb2a8226ce92d66a6718442a784b81a9c28d80ecc5b3bed23cee0
font_04_sfnt_off00015988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15988 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb

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