Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2b606734b803d1…

MALICIOUS

PDF

101.3 KB Created: 2021-09-15 15:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a84362415d208e19734194cccffe42e SHA-1: 162a70aa8c1b906089a1e42bf4a70c859fef5198 SHA-256: 4b2b606734b803d1f24e1407040ef83a29eb38eae86d11a65a36072233da9637
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may leverage embedded JavaScript or other exploits to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://dlabiura.kbo.pl/ckfinder/userfiles/files/katunurowa.pdf In PDF document text
    • http://color-gateway.com/userfiles/file/fexitififogolafif.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/99516983219.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/fuwuvogaxufofodolepubiru.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/rigobufiteronufurutobis.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021091311554473499.pdfIn PDF document text
    • https://pecintajp.com/contents/files/81516073399.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/28178975262.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/on6s204e6a4dnvbcbp3e49vlc2/94629536714.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/putuvukojobelekivonimu.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/difibasaru.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/gopuwopelefujefi.pdfIn PDF document text
    • https://novsport.com/content/File/kuzadarek.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/60448133126.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/86433429458.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/69441080596.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210910205524_oox0mp.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/33726232397.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161354071d4a20---gotomunivadenadozojefu.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/11344090425.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/petibujoluxam.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/87447364487.pdfIn PDF document text
    • http://client.diffuse.info/files/78229257750.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210901_F56561634A0DE779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=screen+cast+in+androidPDF link annotation
    • 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_off000127af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC6 10392 bytes
SHA-256: 994cbd3f4dd05c0b8722c8848c27ac3cfc9180c149be78314ec3acebf1b327d2
font_02_sfnt_off00015764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15764 18568 bytes
SHA-256: c1fc31af33bd78b3eae92607015c1ea79f45786ee85ba583fa20c4601e3b0984