Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75fa4581cc5428f…

MALICIOUS

PDF

71.6 KB Created: 2021-06-01 12:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c12467507ab197de5321d1f13cc7d554 SHA-1: 409f2f7b23044f5bc6ad4e9f3aa45931d00b5e67 SHA-256: f75fa4581cc5428fe25b9909215bdbe70d3709122dc1a2f0f1867050bf3052d4
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, contains text suggesting a lure related to a "lucky man season 3 episode guide", which aligns with the external URI's UTM parameters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://midufefew.ru/123?utm_term=lucky+man+season+3+episode+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405946/normal_604cfd5b70f7c.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4450415/normal_60b140845dcd2.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/6c953ebb-8118-4338-9893-54403c24f958/62616263954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3a934e6-27d2-48d9-9c96-b073587f7ad5/omron_blood_pressure_monitor_reviews_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d769aa62-ee37-4c84-8781-b7c424ddb0d1/how_to_start_tai_chi_at_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ced98a9-45a5-4b93-98a6-8455330b7d4b/54175849597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fdae5b7-e687-46f2-ba57-0902283850bb/present_perfect_ever_never_just_still_already_and_yet_exercises.pdfIn PDF document text
    • http://garigor.pbworks.com/f/manual_carburador_solex_34_34.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c45a12f-e783-4740-958c-bdbd925f952e/how_to_make_a_easy_paper_box_step_by_step.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/w/file/fetch/144434754/give_me_liberty_5th_edition_volume_2_-_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64067755-2dde-4df4-88e4-3a0eac9be5f6/faforurawejeganiwigumezib.pdfIn PDF document text
    • http://sajateves.pbworks.com/f/9778443270.pdfIn PDF document text
    • http://tosuvop.pbworks.com/f/printable_the_love_dare_list_1-40.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfbc9b05-fd0b-4baf-9c81-7203994020ad/nespresso_lattissima_instruction_manual.pdfIn PDF document text
    • http://savavaze.pbworks.com/w/file/fetch/144453738/minecraft_pe_mod_menu_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0554d93a-a257-4e6a-aec5-dd8f9490ec45/how_to_find_concentration_from_optical_density.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_off0000d844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD844 5536 bytes
SHA-256: 6210d038cf9d36ca7f2721a6c5128869da24af2bbb7a4f2afe0b0c7af8b345f3
font_01_sfnt_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 11228 bytes
SHA-256: d4ba5d0ff11a01c4d8d5d33dcaf52bcfc15fb6cee5501fb57fea46611781e44f

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