Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5230a224b6c1e7…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 10:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c653860ed0c402b457d9df5f5f13fb0 SHA-1: afd356ee4709eb0141351354f24396079466cef9 SHA-256: bc5230a224b6c1e7e4937c137fea41d5076bc24f0d24739f8bf1d9b17d9619ac
186 Risk Score

Malware Insights

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

The PDF contains multiple links to external resources, with one specifically pointing to a suspicious URL that is algorithmically generated and hosted on a potentially disposable domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://asia-test.informacittadino.net/media/files/gexaxetujifugij.pdf In PDF document text
    • http://millionsdiscount.com/mo_images/files/70535155498.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/15915032304.pdfPDF link annotation
    • https://unibel.pl/pliki/upload/file/juviwososinemowe.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/legusemefajedijarivug.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/lebaw.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/12478939955.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/rilaxabajemaburasodu.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/limibaxebumalozufopadon.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/durusalaruwibozit.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/77679178917.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///sumefazumikubudokibolivof.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/butigesenuva.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384e6cf279d---31647576876.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/38785197912.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/zitomizerisizese.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/95638663615.pdfIn PDF document text
    • https://shibbirs.com/media/files/javuzufazatekopewu.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/36691090021.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/20197573776.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/72778737191.pdfIn PDF document text
    • http://fkhd.cz/data/img/jozomiloxivalewulamelo.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/42159244993.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/027dc6d693bfff49721225802f86ff44/86101841956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=muscle+car+simulator+mod+apkPDF 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_off0000d3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A6 20208 bytes
SHA-256: 727353674994e030b0f4ee9fcd5734829fa628dc23b307d40024aab88eae33d9
font_01_sfnt_off00010959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10959 10756 bytes
SHA-256: 42a2c457f7ec0b7e48e28b1acc2eafa96a560b844902773b2662055c36bf5682
font_02_sfnt_off0001221f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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