Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff2e768c3179da7…

MALICIOUS

PDF

71.5 KB Created: 2021-03-09 23:16:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d8c54324adf9b2177ab372fa86bdfc17 SHA-1: 831b336688cf207439d07200b7f48c9bcbb1c864 SHA-256: 4ff2e768c3179da7449e0c92e7070177e317ff104bc597d8f100f7d7ec77ae0c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains an embedded URI pointing to 'https://pelibifir.ru/wix?keyword=microkorg+xl+plus+manual+espa%25C3%25B1ol', suggesting a phishing or malware distribution attempt disguised as a search result for a manual. The PDF also functions as a link farm on disposable hosting, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wix?keyword=microkorg+xl+plus+manual+espa%25C3%25B1ol PDF link annotation
    • http://dirozigumifew.scienceontheweb.net/list_of_subordinating_conjunctions_for_complex_sentences.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/pojinuburijaxirawi.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/hegelian_dialectic_politics.pdfIn PDF document text
    • http://jajosez.iblogger.org/emulator_ps4_android.pdfIn PDF document text
    • http://wunadimizurened.medianewsonline.com/dekizif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vonodese.epizy.com/20638942407.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9426a33f-4acc-4b11-9b71-2b89c7f8a30b/last_wish_raid_wish_wall_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/bisux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e847cf-6aa9-4b29-baee-f2f6d8559008/tapozedamemab.pdfIn PDF document text
    • http://sitotozip.rf.gd/arduino_pro_mini_328_p_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6dd827a-c3d0-42bb-be67-30789ec31b64/maytag_3000_series_dryer_thermal_fuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cefb6cd6-7f1e-478b-94c5-23b89253484f/nozojogimaneda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de3b69b9-0048-464e-b154-5c3bd111b606/nike_will_donate_shoes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e869716a-45c9-455f-a9e6-71f9b9b0bef0/what_reading_level_is_flat_stanley_his_original_adventure.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/56666858979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f5f0c37-03f3-46c6-b6a3-77e20e111622/origami_flower_step_by_step_instructions_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e94321d-594b-4f23-af62-aa0b3961031e/64851615579.pdfIn PDF document text
    • http://tosowepexinuf.epizy.com/13685969108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2b2c991-3879-49e1-9395-36482b68e219/court_of_thorns_and_roses_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af0deebd-e778-45cf-a2a0-fad2bce72390/viduvogoxige.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/little_house_on_the_prairie_book_set_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d35ecac2-aeb9-4ada-a3ed-0d64dd6f38eb/trig_functions_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/40630122615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b18ce6a1-79f3-40c5-86c8-1901f113edd8/40398751889.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_off0000dab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB7 5600 bytes
SHA-256: 22ef9e74989baa9a792c87b44618691353708bac74437458e97421b075f572ce
font_01_sfnt_off0000ed7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 9668 bytes
SHA-256: 66a3c0e9c9e389fc96a0189f9cb6da95cbaf8f45beade4eb46779936a439f73d