Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37c67889cc51f95…

MALICIOUS

PDF

98.1 KB Created: 2021-10-18 02:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c053ddfc19cdde0093ef5b69f56232d0 SHA-1: 06b1ff14234a757b3abfbb7d62c0bc072e4edfbb SHA-256: f37c67889cc51f95c8f056fd3fa88597565f3ce52fdee894f929b4430626a43e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically identified as phishing/trojan. It contains multiple embedded URIs, one of which points to a raw IP address, and another is part of a link farm hosted on disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The ML_NYX_PDF_MALICIOUS score of 0.978522 further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9785

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://reazfarah.com/ckfinder/userfiles/files/56779451701.pdf In PDF document text
    • http://santabruna.cl/upload/file/nifogebupufon.pdfIn PDF document text
    • http://njchemland.com/upload/files/51203182034.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/fululasizatotakefipijo.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/gjgg0gckhs0pd1975rhdli04eg/nixebajubolevuwopazelem.pdfIn PDF document text
    • http://erimti.com/userfiles/file/85940907060.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/nigubipuj.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/41054986017.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/26600223947.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/tademitimesojujukodu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/31656892919.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/94180707274.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/pinexivokekudus.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/tumogozajatomeloxom.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/74867689000.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/73035109580.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/49027061501.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132b8ddc609f---tobop.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/52715918652.pdfPDF link annotation
    • http://wsmr.us/userfiles/file/vimazeva.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/niwutijaza.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/98089410638.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/wejixuforebokef.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/76016920001.pdfIn PDF document text
    • https://aaaxxion.info/images/file/51091243569.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/2I9n2o-U8HI/uplcv?utm_term=one+piece+unlimited+world+red+3ds+ciaPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 30720 bytes
SHA-256: 8085e75c46a7be2065993fc6c65a717e62e37107227ba7c57fb9974fc466ab7f
font_01_sfnt_off000122fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0D 16552 bytes
SHA-256: 84d6867e08349cc4fefe081cfe095f36ef4e8459d353c2fee1bf34c9717afb8f
font_03_sfnt_off0001521a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1521A 2896 bytes
SHA-256: 97e46024e761262258f66f6b8fe4f0436c36d9c48b55ef436f2da6654f54281d
font_04_sfnt_off00015e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E00 11056 bytes
SHA-256: 8faf4ebf145552a3f7326b28ff6d7fbaee186ef150b544fd416fcbb6ea2c5804