Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a106e835ed080f5…

MALICIOUS

PDF

70.7 KB Created: 2021-09-24 13:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cffa5f3a243f16167f301db289b0de19 SHA-1: 97cae53b7b4dfb769b28cfbba84b75a4e15d4d8d SHA-256: 4a106e835ed080f56a3a52221bbfbbb6c4b007f44a07bd338f6904d298964bfb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. It contains numerous external URIs, many of which are on disposable hosting and use UTM parameters, suggesting a phishing or link-farming campaign. The PDF structure itself is also flagged for suspicious object definitions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://archism.ru/uplcv?utm_term=summoners+war+account+hack PDF link annotation
    • http://miskolciharsona.hu/pictures/file/22072303057.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/81598832407.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/rojaboka.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/sukiruwanasa.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/limexox.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/wuzisifajemebubanenavoje.pdfIn PDF document text
    • http://hidropro.hu/upload/pokikebola.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/8308904631.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/3d3a4fff4d86f910b93518f074ad7a78/zanijevugogezid.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/38004865122.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/poronaxokavogudo.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/14237571520.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/21705868259.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/97693648314.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/1631695874.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/1207353318.pdfIn PDF document text
    • http://unseretochter.ch/images/file/kodisexeluga.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/zeluji.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/69414570787.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/zepalamitudunokavugav.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/55507317467.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/98541983695.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/94756564878.pdfIn PDF document text
    • 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_off0000b01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01E 10712 bytes
SHA-256: 5426d5daf98e1ce5e7ee15b6d625d3cdea77493659415a351d0830af34a230a1
font_01_sfnt_off0000c89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AF 17372 bytes
SHA-256: 249576e53c58f6756540065b556f3e7cdbc1f8443eeff70db354b1477cdd88f9

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