Malicious PDF — malware analysis report

Static analysis result for SHA-256 d847685fdff68bb3…

MALICIOUS

PDF

110.1 KB Created: 2021-10-06 20:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 37fa07c627957f4e0bce2d756b29807e SHA-1: 2eef0dbdd513c2d2508551cf06ad0ae90e5ac292 SHA-256: d847685fdff68bb392e0ae33eedb42eb9efa7f29dd68fc18ee61903a854eeb63
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leading to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=the+term+for+bedsores+is PDF link annotation
    • https://beta.nhatthiengroup.com/files/uploaded/files/9928218353.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/ladosumanerepef.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/22559419323.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/66792728695.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/vudavadux.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/19bec359b85e316cd4d06ce5de8720d9/64732248749.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/jaromewaxadiduribopapuf.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/65020958904.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/sejapepuwujiz.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/77808754859.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/gupakasizugedi.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/55355686014.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/89701603623.pdfIn PDF document text
    • https://33mobility.net/uploads/files/xenotoderedekexifiguxev.pdfIn PDF document text
    • http://poliinc.com/upload/files/18588399861.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/86741008779.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/60056439215.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/43925188167.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/13694604935.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///luremonurubanavizovesov.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109012011236032.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/46637518727.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/tedubezopirekugewejorufid.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/17871558291.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_off000143da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DA 21068 bytes
SHA-256: e84f39e640f5779e3ef5557d0ed773aa24f4a1b1a77dbc77d72f6e824bba211d
font_01_sfnt_off00017afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AFC 10412 bytes
SHA-256: cd07f5fb1db6111ee067c92715d292b23f44ad2d34f4ecd43a6a22c53c24f29c
font_02_sfnt_off0001928d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1928D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1