Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb939d0438b7a5ba…

MALICIOUS

PDF

82.9 KB Created: 2022-05-30 11:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2022-07-15
MD5: 8374736fffe40f78060da953a860ba00 SHA-1: 2f5022876ba6ddbec352616326ede749724a3dda SHA-256: cb939d0438b7a5bacd108dd089e76d794b1b31f7c6a56cf28c17c806734e363c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating a large number of external links, characteristic of a link farm or phishing lure. The primary URLs extracted are likely used to redirect users to malicious content or further stages of an attack. No scripts were extracted, and the document body was unreadable, but the PDF structure and URL heuristics strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://loheb.co.za/YmrXLWy8?keyword=saxon%20math%20algebra%201%20book%20pdf%20answers%20pdf%20printable%20form
    • https://euproducts.retailtrendsbv.com/userfiles/file/nowanafokagoteganobak.pdf
    • https://sesesisemiv.weebly.com/uploads/1/3/4/7/134746737/4420289.pdf
    • https://bisarenofibes.weebly.com/uploads/1/4/1/6/141615995/regigibirukozigewis.pdf
    • https://defosojuregoko.weebly.com/uploads/1/3/1/3/131383900/rafuf.pdf
    • https://zepezevaligo.weebly.com/uploads/1/4/1/3/141371304/pewete.pdf
    • http://fristaxaties.nl/UserFiles/files/gajixirigez.pdf
    • https://kuwavumiwedow.weebly.com/uploads/1/3/4/6/134673312/wusatokusekamadevupo.pdf
    • https://wazaziti.weebly.com/uploads/1/3/4/0/134018063/16f5a823867.pdf
    • https://semopuwelonime.weebly.com/uploads/1/3/1/8/131856984/18bd72b262f6.pdf
    • http://studiolegalebisantis.it/userfiles/files/retibokeloxigerijivenud.pdf
    • https://xukovijo.weebly.com/uploads/1/3/4/6/134611059/zikexiw.pdf
    • https://juzowesefuzifi.weebly.com/uploads/1/3/0/7/130775985/3103671.pdf
    • https://nofemifi.weebly.com/uploads/1/3/2/7/132710694/52548b642da.pdf
    • https://anfauglir.com/images/file/540415382.pdf
    • https://zebevofekiz.weebly.com/uploads/1/4/1/7/141782798/3942000.pdf
    • https://tonirifiw.weebly.com/uploads/1/3/4/4/134468227/bufufoli_wiwavul_nofatib.pdf
    • http://kag.fr/userfiles/file/75458470551.pdf
    • http://serting.eu/userfiles/files/kogoxuzilikifexegipepes.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_off0000de34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE34 16792 bytes
font_01_sfnt_off0000f646.bin
ff439ee511b002f554863e79472a9382d4f10ba1e6de935c6181dcd0f5129af5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 17212 bytes
font_02_sfnt_off0001237a.bin
028e7fbb593d275389afcb348d62fae072f5349a7afc1498fd0d103bba7c38b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1237A 11492 bytes

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