Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b182d7f75b4a31…

MALICIOUS

PDF

84.6 KB Created: 2021-03-07 14:48:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 66ab8aabbc9d269d1c0d40503a517851 SHA-1: 7b385d20dc1d48463add5e0aa247bd6e5f3d7e54 SHA-256: d5b182d7f75b4a313a46dd70b3a7f8e1add0d2faeda91c249db56fada03e1e37
224 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, one of which is identified as a known malicious redirector. The document body, though partially corrupted, suggests a lure for downloading software. The presence of embedded URLs and the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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=download+adobe+premiere+pro+cs3+free+full+version In PDF document text
    • http://endi-itali.space/technical_drawing_with_engineering_graphics_free_download6r4qg.pdfIn PDF document text
    • http://cmbclientes.com/moxenosudebutiveli8996f.pdfIn PDF document text
    • http://dnepr24.info/adobe_flash_cs5_animation_tutorialuwzja.pdfIn PDF document text
    • http://gaydating.world/jabra_step_wireless_earbuds_blackusbs9.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/14410400442.pdfIn PDF document text
    • http://skidki-day.shop/microbiology_made_ridiculously_simple_edition_60tpl6.pdfIn PDF document text
    • http://bibopasaxuvibu.mypressonline.com/vuratupegiwunovo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dazemi/mozilla_firefox_previous_versions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a7a7c39-cc0f-4adc-a446-d2d33e5a3259/lateral_thinking_riddles_for_adults.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71d7adbc-4164-4ff6-8382-b545e05b7305/87134090209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10c5b715-97c0-45a2-ad3e-a34877c60ae9/kidde_nighthawk_combo_smoke_co_alarm_model__kn-cosm-ib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7866c0f9-03db-4477-864f-250901598abb/sony_icf-cs15ip_remote_control.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0be05aae-47bf-4c76-b4ba-dd508d6d0c70/74089732280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4478cabd-7763-41ef-a03f-ea9308475216/liged.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/870bebb3-5d1f-43a5-a94f-8e77a3d278e6/tepuzabudumijetofapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9b2b0cd-94b2-48ff-8440-29fadef24440/xezagujine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3793e14-0d35-4233-9298-b0b3bbb9c6c8/nonutezono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb0835f6-64da-434b-bb8f-38d7f47bfb56/dolozebere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a652203c-e64f-4e91-a19d-7065e65e0414/whats_the_best_crib_mattress_to_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd65a5c1-cbd4-4bd4-bad7-dfddef81e976/arris_surfboard_sbg6782-ac_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e076bdc-95c8-41e7-8235-19d30fb5074f/1994_mercedes_e320_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba1b4cb4-70d1-42b5-a2e9-05f17346f7c2/what_is_the_area_under_a_speed_time_graph.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/how_to_load_staples_in_powershot_5700m.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
    • http://scripts.sil.orgIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 5756 bytes
SHA-256: 28052ec5a08c422116c3a5a8c05baf422aaa6dd631664e0cc4d23c942648f8c3
font_01_sfnt_off0001049d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049D 11332 bytes
SHA-256: 3525c732c8a197dec4912f2f96f57aff79be0fbbd4af3018e6a2c22e79b3b679
font_02_sfnt_off00012b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B14 8192 bytes
SHA-256: 07310be7480547058e0e6fc0580d2a86d13a29378561f8382e9e6ec269236f0f