Malicious PDF — malware analysis report

Static analysis result for SHA-256 58172611fe25cb70…

MALICIOUS

PDF

78.3 KB Created: 2021-09-09 04:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 94b443668d116cbb10d271f89a5bceb4 SHA-1: aad8e257d18e01f4a771751843fd64850db7e5d2 SHA-256: 58172611fe25cb703f0e25b9953938a893a44cf05d04d0b16247d4f41d37df62
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on disposable domains, suggesting a link farm or redirection mechanism. The presence of a 'download' button lure further supports the phishing and malware delivery intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=minilyrics+for+android PDF link annotation
    • http://hotelgiottotorino.com/userfiles/files/javaxigajenatagako.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7b2658be82ca8723219436dc35e14931/zibunifagokavesedikel.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210908_06E93B4B8F1F92A8.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/12217258636.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/63809771712.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/migemoxebe.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/38549113252.pdfIn PDF document text
    • http://email-database.info/userfiles/file/1416264350.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/5183601209.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/7941926414.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/bomugojokel.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/71639284636.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/wowebifijolikun.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/1222157950.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/junikixixo.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/fonetakuketamesolupuj.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/37010998348.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/32369969902.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/nuruzevozufemulufowuxuto.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393f53c9e6d---lemazepofisipu.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/pegejizusugadexulitisuj.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/ruzunafavonaluxize.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/18974924079.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_off0000cd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD05 10348 bytes
SHA-256: 91f2a08714e9338efed06b59d2b03678d6fe78071be29a7d699a0df140b0c758
font_01_sfnt_off0000e478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8A 18000 bytes
SHA-256: 22afc529dbcf2ae98cc522ef890e99554499d117be73d43596f373ce2340012f