Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ef65b136fdf553…

MALICIOUS

PDF

80.1 KB Created: 2021-04-07 16:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 22777054e2864eaeaf3dba67fd22032e SHA-1: c8e7c6a31fe89b26ef04b7d9c4872be2ff484f65 SHA-256: d1ef65b136fdf5539ecd1020fbe97b1d60daf84b961c2669a6b3a291c22bbd7e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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 https://fokemale.ru/strik?utm_term=gun+powder+for+reloading+6.5+creedmoor PDF link annotation
    • http://damewumesigalut.medianewsonline.com/how_much_does_the_development_for_taxi-booking_mobile_app_cost.pdfIn PDF document text
    • https://dezirivudamowi.weebly.com/uploads/1/3/1/8/131856369/5934249.pdfIn PDF document text
    • http://batmbatm.ru/66438845268v7e7m.pdfIn PDF document text
    • http://xtreme-sport.ru/28424178222vx9sq.pdfIn PDF document text
    • https://nefolebar.weebly.com/uploads/1/3/4/4/134400051/fedepufaso_xevaxo_poxuroduluveki.pdfIn PDF document text
    • http://help-service-support.com/72168062895czh3.pdfIn PDF document text
    • https://dejokorakas.weebly.com/uploads/1/3/1/3/131379117/9d050a4baf681.pdfIn PDF document text
    • http://nupewijanetari.medianewsonline.com/bacterial_conjugation_lecture_notes.pdfIn PDF document text
    • http://harkateine.fun/english_speaking_guide_tokyoy4djl.pdfIn PDF document text
    • https://mixowobigasobu.weebly.com/uploads/1/3/1/1/131164278/1471992.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2e23adc-87be-4f8a-ad41-3cbf342f137a/hisense_40_inch_uhd_smart_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e14ea92-118c-4307-88ac-1c47ad1a9494/model_3_price_reduced.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/whirlpool_owners_manuals_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9bdc140-1036-4f92-8ed5-d5fc54a50784/cuantos_aos_tiene_la_tremenda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fae36f7-9e91-4833-8036-e4201b5c32fa/bepawe.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/why_wont_my_canon_scanner_work_with_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/pudoz.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_off0000f97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 5728 bytes
SHA-256: 0f767c1ec2bcf4c62de83c9b5bfa862c4b739b441dd61602973567b3f1f2d5a2
font_01_sfnt_off00010d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D13 10712 bytes
SHA-256: 7cb3dec32d01e8ac7df460919c9faea973ccf0fe2fe374f782b80abe66d6e36f

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