Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b757522f6a8fd0e…

MALICIOUS

PDF

76.6 KB Created: 2021-03-07 09:16:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 14c5fc0437b77f6aae75eac59681e478 SHA-1: 3fd70e4606ab77e8cb4c52772ce58d1aa0ae3067 SHA-256: 7b757522f6a8fd0e2ff3b42cf1ddc4e5c7553bfe80dc39efccd2a3d0c02a57a7
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. This suggests the document is designed to direct users to potentially harmful websites, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=que+formas+de+expresi%25C3%25B3n+oral+existen In PDF document text
    • https://tikuvafijosil.weebly.com/uploads/1/3/4/6/134685963/6dc03456570088.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383170/normal_5fcf988cd2370.pdfIn PDF document text
    • https://jubiwaxu.weebly.com/uploads/1/3/4/6/134645567/worexo-tujagesade-fenunasipiseluv-vawexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393370/normal_604116535eaa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490132/normal_6012a991a3181.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459036/normal_5fed2eec6acf6.pdfIn PDF document text
    • https://jubigugatuse.weebly.com/uploads/1/3/0/7/130775741/kuzifosakube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372080/normal_601c958f38e1a.pdfIn PDF document text
    • https://bedaruwi.weebly.com/uploads/1/3/5/3/135326402/pefuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_6d45ea337d9c4e759c436cdedc24ac70.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d88c6b-7665-477b-83f3-9668576d7018/69061425693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb252adc-21b0-4d56-98be-4a838e3f10fc/49712873211.pdfIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_8e89540c4cea436abcdb9beac1fc1e08.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cb3fe6f-ae2c-4072-926b-0b47d004c186/are_there_any_living_cast_members_from_gone_with_the_wind.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/short_stories_in_english_with_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/trail_wallet_travel_budget_app_android.pdfIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_04cbf0a6508b4350b73df19509caf47f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/53733194490.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/jugozumowadileterisapu.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/writing_slope_intercept_form_given_two_points.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f383fd4-fed2-4eb3-b100-f57f8b650cdf/folewugobujuzumupuvupimu.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/44596657787.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/magnetism_worksheet_for_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/tikenujar.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 5452 bytes
SHA-256: bf75de7874c3e704eeb21864c72317a857d64463f2d5228b92fcc5eb222cd558
font_01_sfnt_off0000fe23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE23 11292 bytes
SHA-256: d5e788372ba3d5c5da292f10071207efc806022349f022a026f70e497ba82543