Malicious PDF — malware analysis report

Static analysis result for SHA-256 943b83c21df24f38…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 05:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b21fe69ea659b189eb371a4de5ab456 SHA-1: 1bb4bbb6df1e36b6a59ecfec3f09847468f324fe SHA-256: 943b83c21df24f38bcf21992b21e932aafcbb4c7c62c811cefbecc5da5840877
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially malicious domains, identified by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and ML_NYX_PDF_MALICIOUS. ClamAV also detected it as Pdf.Phishing.Trojan. The presence of these indicators strongly suggests a phishing or malware distribution attempt, likely leveraging the embedded links to redirect users to malicious content. No scripts were extracted, but the overall structure and URL distribution are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://queure.ru/uplcv?utm_term=3d+room+scanner+app+android PDF link annotation
    • https://sicurezzaips.it/uploads/file/31418945164.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/14144798253.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/depugavunogagoxokal.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/26765836861.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/54677111493.pdfIn PDF document text
    • http://belean.pl/userfiles/file/10193886878.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/75441587553.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/ladofi.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/gitodegupidijapovivi.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a81cae3bed---28817237849.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/55562035030.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/11884186707.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/lamexagosokileli.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/poketamuxigibopatarik.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1632038070.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/25241476125.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/6477667038.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/43697062756.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457406761b3---xamalupejezabelesulut.pdfIn PDF document text
    • http://soc-in.com/data/media/files/19549316002.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/waman.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/gasakarepupodetisex.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/tirogiforetipuzapo.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/18181848383.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_off0000dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDA 17224 bytes
SHA-256: 2986d2d943a1053ede23bab5c51e874aac077ed5a08a0c335bd6afe8865224f3
font_01_sfnt_off000108db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F2 10608 bytes
SHA-256: 582069f5eecde55d90cbc4ec7609b5436ec1665d70788428634a39b095ab1be6

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