Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de4eba2d1b30973…

MALICIOUS

PDF

74.3 KB Created: 2021-06-09 16:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8d5ef5f1dd65c984c4b7765723e45177 SHA-1: 53eddb7b0028757bf4d5976f9351ec5c38e153be SHA-256: 6de4eba2d1b309731e59aa3fce37241cbbe876e1f7dc84d110694d0a4034cb2b
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm hosted on disposable domains, designed to redirect users to external URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. The embedded URL points to a domain associated with a link farm, likely a lure for users seeking a PDF to JPG converter.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://nomylo.ru/pbw?utm_term=pdf+to+jpg+converter+below+200kb PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4423471/normal_60b4227f7248c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410013/normal_5fdd93f669b68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489415/normal_5fc7b56b780ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368958/normal_60668ac20b970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415534/normal_605a030b9060c.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4450244/normal_60b1a6d222bf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446489/normal_6036736db7b03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485010/normal_60268de23851c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401972/normal_60427e79290a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_5fe9af9a20d14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501770/normal_5ffd7e64af8ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368475/normal_5fd1306db6bae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/40fe17dd-d67e-443a-898d-6122d2ae1b94/consumer_closed_input_channel_or_an_error_occurred._events.pdfIn PDF document text
    • http://ririgifavem.pbworks.com/w/file/fetch/144795021/what_the_bible_says_about_masks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d4571e-8e74-49b0-9d3b-331b7096350a/family_medicine_eor_blueprint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50a535b3-54dc-4b12-890c-30a611f8f69b/maytag_dishwasher_mdb4949sdm0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45252943-8686-4e2c-a582-11059c984b86/what_type_of_engineering_will_be_in_high_demand.pdfIn PDF document text
    • http://sajateves.pbworks.com/w/file/fetch/144464112/does_methanol_smell_like_acetone.pdfIn PDF document text
    • http://figinav.pbworks.com/w/file/fetch/144663033/tiffany_glass_lamp_shade_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a230058-137b-4dae-8714-94b99cb85103/46178167183.pdfIn PDF document text
    • http://vugufosenene.pbworks.com/w/file/fetch/144478626/how_to_get_saved_wifi_password_from_android_phone_without_root.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daafd400-82a7-45f2-a71c-2fbc7826c0cc/70573722901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b52ffb9-e843-4aeb-9b88-60ce61c1ac25/41752915113.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_off0000d8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B7 5380 bytes
SHA-256: d408a4976f1cbdc193cf0c737d0ce9a587b5f0094acef734966df31ecb912e28
font_01_sfnt_off0000eb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB37 10084 bytes
SHA-256: 0508988e046542283a48772df0862fbf8991ad15a0692929f70a14ac35d5c7b9
font_02_sfnt_off00010dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC6 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3