Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c32343d9a5df5d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 21:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 08b8d5228291d1d2090ca18436279504 SHA-1: 86aebe3d92b07b334dd36737357e44b5ba1467eb SHA-256: 84c32343d9a5df5da814127d8e81d1acee87b9f45d30ec7a2cc85b8bd0f76dec
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 embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded content are consistent with attempts to exploit users by directing them to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.chatanakonci.cz/userfiles/file/31259989016.pdf In PDF document text
    • https://mr-alian.com/upload/ckfinder/files/38989822968.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/6987007356.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/vuxelenulafeniperi.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/83268906108.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/19172480865.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/fiwij.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/rajogovu.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210911_C7220963D0932715.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/42924949200.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210910101121.pdfIn PDF document text
    • http://fkhd.cz/data/img/pojilu.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/gitefepuwanol.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/tuvikatemoxowaboza.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/44332273905.pdfIn PDF document text
    • https://jensbrode.de/files/file/kabunibetorejupodine.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/naxitulobifano.pdfIn PDF document text
    • http://alcantara.cz/data/file/82561394342.pdfIn PDF document text
    • http://teifsepahan.com/files/file/lubivop.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021091400111473499.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/xudugipupa.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/61410538645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=day+widget+androidPDF 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_off0000d663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD663 18368 bytes
SHA-256: 94da9480252bd874f9dc833b5c544a2c392038f74ca9eadab25344641d9680f9
font_01_sfnt_off0001057e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 10412 bytes
SHA-256: 3d3498c16c0c6b2ec09e814bf6e936abb6713df08de4b6f5b873654ac5a29d51
font_02_sfnt_off00011d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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