Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac0f099ae6f68a0…

MALICIOUS

PDF

69.2 KB Created: 2021-09-28 11:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5d13dd26b71fecadfea9c167f1d18a97 SHA-1: ba3934f0a34c843cd804eed29b82db5c821fc7f0 SHA-256: 4ac0f099ae6f68a06edad1d4dbe903627a49a0355e5b299a77dbdf1ae217cce8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://chcial.ru/uplcv?utm_term=preamble+to+the+us+constitution+pdf PDF link annotation
    • http://mtegl.wsystem.sk/userfiles/files/natilinududawaduzesopi.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/23109007223.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/79747734954.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/9944100269.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/55662578713.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/28004426565.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/ranuwubarujiwop.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210911193759433633.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/bamotufewagajekufojupe.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/devuk.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/78199341785.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/87639766242.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/12183050693.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/15358287360.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/tizupina.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/92546576059.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/tebupebovesi.pdfIn PDF document text
    • http://dc-8aaac82755d3.breakthroughwell.com/userfiles/files/22747452575.pdfIn PDF document text
    • http://pbpharm.com/upload/files/23410967725.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/lexepiwukagufakizor.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/6lc2lr1knl1o8939g0pg33a7n6/jajupo.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/45458600446.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB045 14864 bytes
SHA-256: ebd1833294c53321cbd72c1b61cc0fc49830c6143ea5d005d1298adf91bc0c8b
font_01_sfnt_off0000d570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD570 11128 bytes
SHA-256: 70b41162871f5fa0b88a4357fc98b9acb9f9ad3e469b5649c2e64e50b8e598e9
font_02_sfnt_off0000eefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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