Malicious PDF — malware analysis report

Static analysis result for SHA-256 5943cdba6a7aec1a…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 20:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b5be85cb87b1140521180ef8291261db SHA-1: 9ebea74aab07e9182b30b839eff8a329e0799359 SHA-256: 5943cdba6a7aec1aac486a5670de745e630d3e6ec2d11a22ff276db06c976030
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains, and is flagged as a link farm. The 'SE_URGENCY_LURE' heuristic suggests it attempts to create a false sense of urgency. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://canadanur.com/resimler/files/56933104078.pdf In PDF document text
    • http://duda-tech.pl/dudatech/upload/file/zujiwepunava.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/1325200491.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/wutomozezuwef.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/70315386355.pdfIn PDF document text
    • https://majubesar.com/contents/files/melaliwimakafop.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/famokakajewikoxek.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/runojolifobefawubanusotik.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/pixomiwak.pdfIn PDF document text
    • http://maxbrio.kr/files/files/64093494622.pdfIn PDF document text
    • http://pi-consulting.ch/download/53824722890.pdfIn PDF document text
    • https://negaratoto.com/contents/files/84083935066.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/nojubaralewirewu.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/45942586596.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/26629898497.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109230746324358.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/rarexikopoxinedumegujodu.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/46116814769.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/xetajifuwerafoxofurigis.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/94398496260.pdfIn PDF document text
    • http://otczenacts.com/media/files/togowiriximizave.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/fufivajejemekivodofi.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/bekuwugufuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=hill+climb+racing+2+halloweenPDF 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_off0000d54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 18032 bytes
SHA-256: 9bfe6269d1d3f8d720b3f27c8382bb792b85d1a503419c9874ed6454427c6875
font_02_sfnt_off00011c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C98 10748 bytes
SHA-256: 4430aa374083541a28fcf6b99d6eaa2cda85999422c0069e226c3b87bc1537e3

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