Malicious PDF — malware analysis report

Static analysis result for SHA-256 185fb19fa2cb15e8…

MALICIOUS

PDF

80.0 KB Created: 2021-09-23 16:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e9d2df268e2d7044c9ac37bbf14e7aa5 SHA-1: d3c8cdb8b631e6e3f7a3a067cab2d498a2b65593 SHA-256: 185fb19fa2cb15e8f4e99a7bcdb41d44a82e03041664e48ff4dbca093d1eca4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, including one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=how+to+mirror+phone+on+pc PDF link annotation
    • https://nezrenpin.com/calisma2/files/uploads/66880661483.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/tugujibokitipofiso.pdfIn PDF document text
    • https://chineseclothingonline.com/File/63311722100.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/0n3j4p76mthpb551nibmtvgn58/10957208313.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///47662105635.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/tefafisu.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/3674014331.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/tumowapokulipojivek.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/66601491929.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d8da73506---labudewi.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/54360234272.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/norifemepujemeja.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/30974195761.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/8024654864.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/juxapinelojipopubusonaded.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/46802869354.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/jizog.pdfIn PDF document text
    • https://mimpishio.com/contents/files/neramuj.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/16914670592.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/fefofaruzifunexasan.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/lujelavibi.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/sotofesivawegewevexobo.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/ruwisezos.pdfIn PDF document text
    • http://ranjoysarkar.in/FCKeditor/file/lojiwimurosuzisosib.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_off0000d578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD578 10340 bytes
SHA-256: 35e28d20f343ccd054548a987ef60d2a3e04bd9ff38d350ac41e3b85856eb924
font_01_sfnt_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 17956 bytes
SHA-256: 2797171326231975e31208c5b9307e3a65b29876869aa21849c43874bb70edb9
font_02_sfnt_off00011a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1