Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac99fff649e8082a…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 22:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 059b28952a5c3eab1bbbdb37c22185f9 SHA-1: 857212d0b4b173b479f71c3d8792a1469327f6b7 SHA-256: ac99fff649e8082a6a67757aa2b8d42692f8928cb8b1c3671356ad84f6fac502
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. The PDF contains numerous embedded URLs, many of which point to suspicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the malicious intent.

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 https://atlaskvartir.ua/data/uploads/files/xitivuse.pdf In PDF document text
    • https://autosaloncenter.com/uploads/files/28870817963.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/keragawamefukone.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/88258759502.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/rapudipomiwoguwarixewiwiv.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/xusefenamilozurejuni.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/57304258173.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/vapazomumiwomebapuga.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eee2c585c3---85498258229.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/pafavidoti.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/54035666990.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/45734994370.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/xikafasosuwurisag.pdfIn PDF document text
    • http://lejonhund.com/upload/64805429318.pdfIn PDF document text
    • https://aayams.com/userfiles/file/53921280940.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/10238329520.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161300a5b46e8f---51150231916.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/15592641602.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/molobojosine.pdfIn PDF document text
    • http://tfforming.ru/d/files/54527063033.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/fejev.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/26486378093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mha+episode+15+season+5PDF 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_off0000d9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 10424 bytes
SHA-256: a771465d674f9d782e3892edace2b6fabf95f232fc3f717192727f4bc16c588e
font_02_sfnt_off00010955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10955 19008 bytes
SHA-256: 0da01450560ee0560743a7f541285c1a96f4f492781c3ab0ae0853e762e85aae

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