Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc875250f72dcc8…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 17:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: abe20375c976f8803490afa5c453ea4a SHA-1: 5284a11ae31399233fbe0e122a55f7848b72c778 SHA-256: cdc875250f72dcc8aa0eadfe58c03e8be1049214b49d18e75b384c615cb21d83
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The PDF structure and embedded URLs suggest an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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+use+time+lapse+on+android PDF link annotation
    • http://bygreenpure.com/userfiles/file/zesuremigitojadu.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/fajovebedumewiruvavaw.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/9718817076.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210915234608.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/91502149712.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/nenabowoxa.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161417bf041632---16920695586.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/visuzav.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/diluderowalixitazajixuju.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/29951498711.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/27476817281.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/96344712366.pdfIn PDF document text
    • http://intersonik.eu/upload/files/67070295850.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/3498747821.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/97750644722.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/tifoj.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/favujedokode.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161342147bee5e---50228178998.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/48034617947.pdfIn PDF document text
    • https://777mto.com/contents/files/jujimezirezexuk.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41799385672.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/getugotafezidubavu.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_off0000e7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D2 16972 bytes
SHA-256: f779e50988fedcdfe538cad35401e0c37ee90c62548fed6bdea04808df9d4229
font_01_sfnt_off000113a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBA 10728 bytes
SHA-256: 4932cb0aa5f52b100d6dec335346f15127cc260abb68f9c770d852ca0c43490f

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