Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1b5730ed873057…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 02:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e90fc909129a7b1557f98e905b30778 SHA-1: 91679348cdf50157594fb3236e2feb3e6538dade SHA-256: 3c1b5730ed873057d8491fbcb1d3aaa3d39ea379b6bcddaa3b044f907c554ab9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable domains, suggesting a link farm designed to host malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure aiming to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://hhoasis.org/app/webroot/img/fck/file/winewov.pdf In PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/24626980986.pdfIn PDF document text
    • http://24cvety.ru/upload/files/wisezulizupomaj.pdfIn PDF document text
    • http://wernitznigg.at/files/70565390676.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/16613497671.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/dijegefafov.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/67699493127.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/41000969772.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/lawawujizipadepizunewomu.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/zoxilesolewatafemapap.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/58476378547.pdfIn PDF document text
    • http://stefani.cz/fck/file/53886599650.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/31206787457.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/kunugodugug.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/83206929726.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/82385932133.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614057319aa36---62311746655.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/90780442568.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cda52d95bd---sanilenemopibodoludu.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/91377291671.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/foguseramujifaral.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/kepegebigigoravekifotur.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/11032379505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=bully+apk+2021PDF 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_off0000ddb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 10084 bytes
SHA-256: b58c31db9bf2b8b15fc0f4fd42f69728b787421ea69c249835bcfe06d831fe5d
font_02_sfnt_off00010c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7F 18300 bytes
SHA-256: 8e5f001eb20c66d67c32ba8db3708cf1bb90131b4643e1992fdc2b446a8fad51