Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d33dd432f86d49…

MALICIOUS

PDF

128.7 KB Created: 2021-04-05 03:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f6ed8c1aa292874aa218af2f7146461 SHA-1: 2c4ac71db889590e008f6c4cb7ea138af4709072 SHA-256: 05d33dd432f86d49850b7b47933ecebdbfe9f5fbf2339291faec5a1a34a56dd8
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are obfuscated or lead to potentially malicious content, as indicated by the PDF_SEO_LINK_FARM heuristic and ClamAV detection. The embedded URL 'https://golowaki.ru/123?utm_term=java+7.+51+offline+64+bits' suggests a lure for downloading software, likely a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/123?utm_term=java+7.+51+offline+64+bits
    • https://vuxidozeni.weebly.com/uploads/1/3/4/6/134669409/zovikekebez_diwisedaxo_saxikosas.pdf
    • http://direkepexeg.22web.org/sefotimuvoganozubemo.pdf
    • https://jazemajotejavux.weebly.com/uploads/1/3/2/6/132681398/8232454.pdf
    • https://cdn-cms.f-static.net/uploads/4459774/normal_6064844e9236a.pdf
    • https://vixagukire.weebly.com/uploads/1/3/4/3/134364056/5434803.pdf
    • http://50offshop.info/bumuzeximopexawululusufa83i6a.pdf
    • https://cdn-cms.f-static.net/uploads/4531626/normal_601584107e77e.pdf
    • http://varietystore.website/physical_science_textbook_in_bengalii1od0.pdf
    • http://znasila.ru/photoshop_cs6_full_ingilizce_indirkjuv1.pdf
    • https://suzotavuni.weebly.com/uploads/1/3/4/7/134765747/218da00e9dbe6d.pdf
    • https://telisawe.weebly.com/uploads/1/3/4/4/134466193/ximuw.pdf
    • http://zoomita.space/pisifugiva8e9fk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0bd666b5-34a8-438b-9052-9ea107b1016b/printable_julian_date_calendar_2018.pdf
    • https://uploads.strikinglycdn.com/files/270a342f-c2f5-4f8e-ae9b-f02781a4932a/st_edwards_parking_map.pdf
    • http://nadadeze.epizy.com/72416483308.pdf
    • https://s3.amazonaws.com/tezofuretejom/parorutafepaxaj.pdf
    • https://uploads.strikinglycdn.com/files/1aa46e1f-6b35-4806-93f4-a50efc9423bb/how_to_install_autocad_civil_3d_2019.pdf
    • https://uploads.strikinglycdn.com/files/8b5be14d-8e47-438b-830f-25ec89d2f163/diwapozobi.pdf
    • https://s3.amazonaws.com/gulapore/pediatric_pneumonia_guidelines_2017.pdf
    • https://uploads.strikinglycdn.com/files/a5d86b4b-ba61-46e7-88a1-630a9657d30d/strangers_from_a_different_shore_chapter_4_summary.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000edc6.bin
784c266aadd7b9997de5ff8bfa2b71a8e108cbd791d316f73855a70978ddbfd7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEDC6 63276 bytes
font_01_sfnt_off0001a84e.bin
35f78728feefea1a87916b0136c7d968fc21acf7a85e82a655a20beba9419dc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A84E 5384 bytes
font_02_sfnt_off0001badc.bin
1a7e433b80d0f5f3a60e4affe94579b006adffc4fef4c9833c5618604be57f34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BADC 10856 bytes
font_03_sfnt_off0001e00c.bin
25a5e6c7c9cd73e1730f271d334b71b3c0ac6385951e3737251623a68d8eef5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E00C 16160 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.