Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6c12bf34eb160d…

MALICIOUS

PDF

68.2 KB Created: 2021-09-27 19:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b8d763dfb371256c87b534b6df06b070 SHA-1: b68fead1fd367eed8f50cf66b68edbc930a64947 SHA-256: ac6c12bf34eb160d2d2ffc55605c9795b2b203bbe4ad15754c5e809307d0ff1e
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's designed to host numerous links on disposable domains, and the presence of embedded URLs points to an attempt to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://hepiran.com/cache/fck_files/file/4771721052.pdf In PDF document text
    • http://wwpokebar.com/uploads/files/bitufaropunepom.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/xoxefugazuzejirusajojima.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210918_EF8FF64D45D5533B.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/rutixojefebufupom.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/peluwuwipidebimewokux.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/73275429349.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/72558961177.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/lidumizunagi.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/23883551918.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/xatunoje.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16147f84e52701---27823596395.pdfIn PDF document text
    • http://apcmagon.com/userfiles/9477425217.pdfIn PDF document text
    • https://priscar.com/documents/files/xerovugefupozavetaluna.pdfIn PDF document text
    • http://alltechsro.cz/files/kudowi.pdfIn PDF document text
    • http://edallyshop.com/upload/files/guwalolusula.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16149e290ec5a8---52622496852.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/24111082584.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/90221098280.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/bisinas.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210925_B786A12CB69BCACF.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/72364900203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=fifa+21+android+obbPDF 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_off0000b088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB088 10192 bytes
SHA-256: cfef184474680bfe001fa9feb44ec2f06bb73cde07e50100f1eedcff96c6b1fd
font_01_sfnt_off0000c771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC771 14404 bytes
SHA-256: feb581d245889e8388272292d56aa74c8da53da2cc6dd6a4c7483d79fd482635
font_02_sfnt_off0000eb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1