Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd60a669b26d5fab…

MALICIOUS

PDF

79.3 KB Created: 2021-09-25 16:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8711e28812f4a71897718c2457053307 SHA-1: 5050399315b483120851c2d93f85690c28a6533d SHA-256: fd60a669b26d5fabe5e09b925395735dd244a143d5ffa61eeb2104dba273e47b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing or tech-support scam. The heuristic 'SE_CALLBACK_LURE' specifically indicates the document prompts the user to call a phone number in a sensitive context. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://egyiksem.hu/uploads/file/rufajaxifixileki.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613534fb10381---51093332057.pdf
    • https://detectagsafety.com/ckfinder/userfiles/files/64768813239.pdf
    • http://impex-italia.it/userfiles/files/89291648802.pdf
    • https://hirurgija.me/files/17858851583.pdf
    • http://universalgroupautos.com/files/others/titizerodebepaf.pdf
    • http://samurairamenbar.com/uploads/files/28552257419.pdf
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/pegabagoronufomute.pdf
    • http://gavionescodeinsa.com/userfiles/regaxanin.pdf
    • http://tourhong.com/FileData/ckfinder/files/20210925_07EC6E43DE8A5C9D.pdf
    • http://insightonafrica.in/userfiles/file/73226593216.pdf
    • http://xinge168.com/uploads/files/20210921173808_120119.pdf
    • https://projektovanje.info/userfiles/file/wufemonagexutiz.pdf
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/kudusepumorabelamutote.pdf
    • http://schokofontaenen.de/idata/66042486407.pdf
    • http://szguilong.com/userfiles/files/gawimimovobij.pdf
    • https://coolinterier.sk/upload/files/gukoxipuvifadagebete.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2ca555d0f---wipemudidorezobek.pdf
    • https://rugsinc.in/UserFiles/files/78274692526.pdf
    • http://dawahcity.com/userfiles/file/pawatorevemevaboxidis.pdf
    • https://fa-vietnam.com/webroot/img/files/60550117724.pdf
    • http://oilspecchem.com/files/41340255030.pdf
    • http://sobateracota.ro/mm/file/90922030165.pdf
    • https://endeligmandag.no/e-brev/data/div/66515215389.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mario+run+premium+apk
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b722.bin
e1013b0397dbbda3de4d8dd7f47dc989040c4f1193bc146115c837e5e2b3b40b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB722 19740 bytes
font_01_sfnt_off0000e9cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 16792 bytes
font_02_sfnt_off000101e6.bin
131019d8ad4f0628de26392c5db00f597d12f914da33e9d143e990aa62bcc7d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101E6 10284 bytes
font_03_sfnt_off000118f8.bin
800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118F8 16188 bytes

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