Malicious PDF — malware analysis report

Static analysis result for SHA-256 878110192b15f14c…

MALICIOUS

PDF

68.9 KB Created: 2021-09-30 11:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3cd5126cd221af41d10490ee960e4683 SHA-1: 76a463963bef41835e08277aebeb5d2873c1b4f4 SHA-256: 878110192b15f14c5810079eea67ac749d17700c0a09578869bf9e0f8f95d7a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external URIs, including one that explicitly promises a "monster legends hack mod apk", indicating a lure for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://smidgel.ru/uplcv?utm_term=monster+legends+hack+mod+apk PDF link annotation
    • http://aptekarynek.pl/zdjecia/fck/file/janulutujirebetadide.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/44561161037.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/61881186425.pdfIn PDF document text
    • http://airmon.hu/images/files/jezifigegutabowugagakovik.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/65505747325.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/42915751535.pdfIn PDF document text
    • http://wangnatheater.bpi.ac.th/ckfinder/userfiles/files/kivowolaxakebupigosu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d43003274d---zugaxipuw.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/tunuvogasizaturufejuv.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210902_482BD7C116E68219.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/63049151265.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/91370445563.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/90828367367.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/9975040634.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109081556036268.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/19338154835.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/33657100461.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea6e33375f---mudixonipezinikutetilig.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/38662332622.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_off0000abee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC405 10956 bytes
SHA-256: 19016aba060f0750ae19aa9a570266ce6514ccb530f2f006b96dd1ad98343cd3
font_02_sfnt_off0000dd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0E 16244 bytes
SHA-256: 06a381e049c68392afb11d8cfbd09ff5a81ba63691dd2aef15c2ce54ab0ff50c

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