Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d9927fb5a86f48…

MALICIOUS

PDF

100.6 KB Created: 2021-03-25 23:04:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d363cfca89b3fdf0a344d26f14d6e0f6 SHA-1: 05852be4e62648cf09dc939c0a3602f3bda64016 SHA-256: 04d9927fb5a86f48a688d8123aca3123fdbc60b9084dcca8eb1b5f6999c52960
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or a distribution mechanism for malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/123?utm_term=businessman+telugu+mp4+songs PDF link annotation
    • https://wawowipibi.weebly.com/uploads/1/3/3/9/133997364/sutovexakep.pdfIn PDF document text
    • http://austritkfa.com/394415959218ngwf.pdfIn PDF document text
    • https://girenofozajete.weebly.com/uploads/1/3/4/4/134476001/8669648.pdfIn PDF document text
    • https://lalemudisezevo.weebly.com/uploads/1/3/4/3/134359520/pokoka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383136/normal_6006841d11e4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496381/normal_5fd2350e38dcb.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/47644601825.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465127/normal_5ff5522123338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393361/normal_5fd76c762e742.pdfIn PDF document text
    • http://universal-kirov.ru/radioactive_decay_problems_worksheet_with_answerskbqy5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369629/normal_5fcf1bbaefb92.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/norozovijalu/ruvadexidafimazipopedekit.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/54219780254.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/ramaxikevidadijodidesode.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/pitogitigufodugivimaziv.pdfIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_78cb86cb886d464ba3c9e0d02abc0437.pdf?index=trueIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_f9390e69332a4263b5327aac6eda2c32.pdf?index=trueIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_d141d4dfc8a8402c8c51df670155c3b6.pdf?index=trueIn PDF document text
    • http://fuvamawijivef.atwebpages.com/istvan_banyai_rezoom.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA8 5064 bytes
SHA-256: 099cdb0a0471a6bd8861e6b9bb5c7cb9070c55780e653fb135d622230b20128d
font_01_sfnt_off00012bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC9 3796 bytes
SHA-256: 07d5a63f08801e8335ffae76026ab15444325137f1c4a518cdc2420be340e853
font_02_sfnt_off000139c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C2 12048 bytes
SHA-256: 2ea119224dc3135a6ce8d76e4545bd819c8e69aa1ae4cfb003f85d7240e9792b
font_03_sfnt_off00016189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16189 16076 bytes
SHA-256: 77d0e41b193f2956426f125f137c5665e22c2099967b8d3a504bff5b234847bc
font_04_sfnt_off00017632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17632 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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