Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d81a94e197f860…

MALICIOUS

PDF

84.4 KB Created: 2021-09-22 09:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8765c8ff5bb642f1c03933efe829f0fa SHA-1: bf668cbac7c2609bf164e7526607bb2c4b90458b SHA-256: 66d81a94e197f860b7d1538dad7304e3dff57e0cec80e82959935fec93be9dcd
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It leverages a link farm strategy, presenting numerous links on disposable hosting to obscure the ultimate destination, which is a common tactic for phishing or malware distribution. The PDF structure and embedded URIs strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://kozhikodedeaf.org/admin/my_files/file/62029189588.pdf In PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/wobiwavedekadomedewu.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/83143649297.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/silegowitizibawa.pdfIn PDF document text
    • https://triosms.com/userfiles/file/xesetelipanawalusobofida.pdfIn PDF document text
    • https://argumentua.com/i/file/buripanomugidi.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/0c64906ddf3ad656f6ccb00f1f15f8a8/kidofesizeripagefevokebu.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/29808151832.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/reduvefep.pdfPDF link annotation
    • https://fpcofmacon.com/nbloom/fckuploads/file/matoz.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/37444299611.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/sawuludajujuxikesudovu.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/20837292722.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/tutapejugavamaniperevuke.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/6707093862.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/66799981673.pdfIn PDF document text
    • http://secretsocietygroup.com/temp/vinney/HTML/userfiles/file/totetujumanozifedozo.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/384e70bc0d238d92351ecd74ac6e7d82/60807897340.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/jumudopukupivow.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/divukirusekerekawufag.pdfIn PDF document text
    • https://armenia4d.com/contents/files/sikabadereniri.pdfIn PDF document text
    • http://asid.rw/userfiles/file/vafakoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+recently+deleted+folderPDF 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_off0000e61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61E 10236 bytes
SHA-256: b14715c33f3ef470d87fffdff1cb01c823c8d347d29a57d2ae281dc83aca409c
font_01_sfnt_off0000fd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 17980 bytes
SHA-256: bc27ac654cc9f76f66cb3d6f1cc185aa33e18fa24c7df4ed0b463f7342ba3baf
font_02_sfnt_off00012bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1