Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a7ce91c1fcbf87…

MALICIOUS

PDF

86.0 KB Created: 2021-09-20 00:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd275cbe98137f52ff1b0f5c26ff2fec SHA-1: 24c5adc6b86fbfb9dc2dbb0c4a82a55844562c7b SHA-256: d0a7ce91c1fcbf879786903b7c76dab24f6b9942e057e33985096a13acd673da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the link farm heuristic strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://irlanc.ru/uplcv?utm_term=android+data+transfer+to+pc PDF link annotation
    • http://tuzvedo.hu/elemek/file/82597063942.pdfIn PDF document text
    • https://amgaa.org/temp/files/venewinapumerejukuv.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/visasivumez.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/37145231420.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///vomuz.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/bilupiwilemekuxunaweguw.pdfIn PDF document text
    • https://aayams.com/userfiles/file/gegivumunazewi.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/84499054833.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/raxagosa.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/teroxe.pdfIn PDF document text
    • http://thecuriosityshot.com/16382494653.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/nuvabu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc45a825b8---96182625670.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/53169482943.pdfIn PDF document text
    • https://network-italia.com/file/tuxazukaxoju.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/ximujixajakewawiduvumebul.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109191346147370.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70772450787.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/88122797796.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/xerubemo.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/21123972064.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146fc1e09307---rodefag.pdfIn 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_off0000f2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFB 18108 bytes
SHA-256: d498479d7653df60a4f9a053349117577eec730e578fafb650f1d12fc5a0f84d
font_02_sfnt_off000139c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C8 10548 bytes
SHA-256: 79b88d0af7bfdcd760b41f4dad5dc55c57d29993d2de429269a915d51affa62e

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