Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c6bd043900add0…

MALICIOUS

PDF

71.0 KB Created: 2022-06-05 01:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2022-07-15
MD5: c77bcba92703690497e78165bb3f21a0 SHA-1: 07c80598a0b52184032fd69ac7e58a8fe75a7306 SHA-256: b0c6bd043900add055ddd37b6acebe7fecb60a26e83062529091824385949216
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which are hosted on Weebly and appear to be part of a link farm designed to improve search engine rankings for malicious content. The primary malicious URL identified is https://tevav.co.za/YmrXLWy8, which is likely used to deliver a secondary payload. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://tevav.co.za/YmrXLWy8?keyword=u%20like%20sample%20paper%20class%2010%20science%202019%20pdf%20free%20pdf%20free
    • https://kexejimeso.weebly.com/uploads/1/3/4/0/134096016/5f4981.pdf
    • https://nowezafe.weebly.com/uploads/1/3/4/6/134616333/xiruw.pdf
    • http://weilandensemble.nl/ckfinder/userfiles/files/losesatere.pdf
    • https://zosagobe.weebly.com/uploads/1/3/1/3/131380163/dolorefo_wumadekorusuzap_zinowowuw_wewab.pdf
    • https://zaguwudezalazu.weebly.com/uploads/1/4/1/5/141523830/f7b9810aeedef.pdf
    • https://donurufeto.weebly.com/uploads/1/3/4/8/134898164/gumukilujujomuv.pdf
    • https://sudodoxusuxo.weebly.com/uploads/1/3/7/5/137501237/nofan.pdf
    • https://wikukexinuxox.weebly.com/uploads/1/3/4/3/134349372/xaziranejabotenix.pdf
    • https://lobigemef.weebly.com/uploads/1/3/2/3/132303116/c3e179096fbc.pdf
    • https://varalege.weebly.com/uploads/1/3/0/7/130738576/duwudag-xadukov-vamowexax-kotixufiv.pdf
    • https://joxuripuziw.weebly.com/uploads/1/3/4/2/134266010/kezoje.pdf
    • http://amadpich.com/userfiles/file/fujaduzagemamusixulukefi.pdf
    • https://ligexomapaku.weebly.com/uploads/1/3/4/3/134321337/6051341.pdf
    • https://kibowoje.weebly.com/uploads/1/3/0/7/130775027/3185753.pdf
    • https://dewosuto.weebly.com/uploads/1/3/1/4/131453399/mabus.pdf
    • https://mojunoletadu.weebly.com/uploads/1/4/1/7/141706659/095975c5.pdf
    • https://petesironow.weebly.com/uploads/1/3/4/4/134495836/baacf3.pdf
    • https://sajulivos.weebly.com/uploads/1/3/1/1/131164476/467813c.pdf
    • https://jurugifako.weebly.com/uploads/1/3/4/8/134869201/kikunusuxojiba.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aa33.bin
2cae2a4b999126eb299f01a8dd314eed154160ac70b8cca26b003251c9859598
pdf-font-stream PDF embedded font (sfnt) at offset 0xAA33 11124 bytes
font_01_sfnt_off0000c430.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC430 16792 bytes
font_02_sfnt_off0000dc42.bin
f5ab5be7a61a5707f2addbd0abb5d4507b2fd142270eb197484dc72d02f2a95d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC42 18780 bytes