Malicious PDF — malware analysis report

Static analysis result for SHA-256 12902d27b6ce5f2c…

MALICIOUS

PDF

92.4 KB Created: 2021-09-17 04:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bced4aba4eedad059558f320baa81618 SHA-1: e08d79eeb78975ed3f53f7a32e1095fd9f8ca764 SHA-256: 12902d27b6ce5f2c2fb3a176e9dae85c3069d6a76d178e9ff509f597fb652fc2
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://synerhu.ru/uplcv?utm_term=he%27s+just+not+that+into+you+cast PDF link annotation
    • https://jurvamartin.com/userfiles/file/3144160707.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/19316141440.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/50428317457.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/fepalefo.pdfIn PDF document text
    • http://pinxedien.net/upload/files/36818239598.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/josusawo.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210907163132.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/rawiwizukijodewenob.pdfIn PDF document text
    • http://e-sheremet.com/img/28059098316.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/fezotililemisidirasavewu.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/walokugurumuliderowitopix.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210914_45D6B07342D390FB.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/gexikedupi.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210913143226263.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161404d85eea7e---xujibodefibubekefuvubuvel.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/15589272082.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/wirefabew.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/vosuxagekixadiwejediruvuz.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/vnbrq117252470icj1qmd4s3s9/73664033093.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/26594530125.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/zolejoxuvivuj.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/74857500927.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/13366487348.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/84916128953.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/60993420327.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_off000101bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 19392 bytes
SHA-256: a2c85402d8f05a3b9e3ae43a71d2702aa0441aafb3645c540b9d36e610de6e5a
font_01_sfnt_off00013405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1C 10552 bytes
SHA-256: db45a5563a988fc13726e50950d19284986119ffdfac39af2eeec437d231eb73