Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c131f71b0b50fc…

MALICIOUS

PDF

82.6 KB Created: 2021-03-29 13:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 564ac8ba05f971b9f5c6334fb5747c9f SHA-1: 0975effc5fd0448a87d0cb3315eb0ab428240ddf SHA-256: 33c131f71b0b50fcd9576a0e6c11020ec6a85bccff82a9a768d00169eae254c7
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The presence of a PDF link farm heuristic, coupled with numerous external URLs, suggests the document is designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual lure. The primary attack vector appears to be directing users to external resources, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/wix?keyword=talking+tom+hacker+eyes PDF link annotation
    • https://tupisefam.weebly.com/uploads/1/3/1/3/131383837/romaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475219/normal_601947f09bd8d.pdfIn PDF document text
    • https://lonunirixug.weebly.com/uploads/1/3/2/7/132710494/6038389.pdfIn PDF document text
    • http://benosetib.iblogger.org/blending_sounds_worksheet_kindergarten.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379029/normal_5fcc98f724ab8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422163/normal_60257f7323cb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488580/normal_600fbbcd6fbb7.pdfIn PDF document text
    • http://pozopamux.iblogger.org/wopidibuvuwomavenoxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_e386c4a9bb514539a325284be7ce91cb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/lawson_s_landing_fishing_report.pdfIn PDF document text
    • http://mujunego.epizy.com/vubejuzelu.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/30_day_notice_template_california.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/childish_gambino_bonfire_acapella.pdfIn PDF document text
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_2f3d561aa4df4d0c8af92830296252f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gopuze/dexuvizuxegugogetanugiro.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/kurutikizim.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/99415216334.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/rising_strong_brene_brown_book.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/android_studio_how_to_install_ndk.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 5328 bytes
SHA-256: aa739dc773a96ca824e345b547fb4416ca974b9d2f66b5078a04c8a435def4e9
font_01_sfnt_off00010656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10656 4196 bytes
SHA-256: 78267ad54a1a2688436822528032aee5bb3e791572d6938e436c1fd9028b880a
font_02_sfnt_off0001163f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 10940 bytes
SHA-256: 79988fb17962d9e71e9478468690962d8c42eea4921bbf4bf6625fdf4a0dc98e

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