Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f271d859fd1bc22…

MALICIOUS

PDF

80.7 KB Created: 2021-03-06 12:00:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a3a34164878aebaad05e37d84d424fcf SHA-1: 929db30fac5ab5be12174253e84c3c264a905b4c SHA-256: 3f271d859fd1bc2266231fc296a8571b53d2184dce99cbfa53f464fa59b298f0
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple external URIs, with a primary focus on 'https://zajinet.ru/strik?utm_term=life+of+the+beloved+henri+nouwen+review', suggesting it's used for phishing or malware delivery. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by indicating a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://zajinet.ru/strik?utm_term=life+of+the+beloved+henri+nouwen+review PDF link annotation
    • http://grantmedica.ru/komebixobogujoputuvilurri1y.pdfIn PDF document text
    • http://nomudepalak.medianewsonline.com/piperepabi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382430/normal_601b82dc56b40.pdfIn PDF document text
    • http://genusttwsr.fun/facebook_lite_download_apk_latest_version_lt6ege.pdfIn PDF document text
    • http://erkutungotu.com/ps4_error_code_ce-33992-6pqo0t.pdfIn PDF document text
    • http://piwulag.sportsontheweb.net/niremamukudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489609/normal_6019b067978a4.pdfIn PDF document text
    • http://lijonotogi.scienceontheweb.net/lureropitelujozebegifeme.pdfIn PDF document text
    • http://bisapusid.mypressonline.com/snapper_mowers_parts_lookup.pdfIn PDF document text
    • http://magazinrf.xyz/criticism_of_marxism32suj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417656/normal_5fedc42a5afc6.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/92539194377.pdfIn PDF document text
    • http://saveyoutubebot.com/algebra_2_textbook_answers_houghton_mifflin_harcourt54iwf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_600d9d6c6002b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476270/normal_6024b7386af5b.pdfIn PDF document text
    • http://nuvagefo.medianewsonline.com/petsafe_wireless_pet_containment_system_replacement_parts.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/4682e137-a843-42ac-b6de-3c27d469e99a/graco_nautilus_3-in-1_car_seat_crotch_strap_adjustment.pdfIn PDF document text
    • http://legokejapo.atwebpages.com/swear_words_in_arabic_to_english.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/hoover_turbo_scrub_spinscrub_50_carpet_cleaner.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/black_and_decker_easy_feed_trimmer.pdfIn PDF document text
    • http://nekelaxowe.atwebpages.com/puralujopesibijofuzoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bbcdbc6-10f0-458a-b858-5026faf50563/how_to_make_easy_chicken_casserole_in_slow_cooker.pdfIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/dykes_to_watch_out_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/743cf7f9-ffe1-45b5-9632-c4235071c8d8/tuzopanujezojoxaloka.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/caulfield_grammar_school_uniform_shop_opening_hours.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/the_bugs_bunny_road_runner_movie_ending.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b26e3f4-eea7-43ec-a67d-101a9474fc22/vakapegoxesisuzuvade.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/raw_broccoli_nutrition_information.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_off0000ff4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4F 4840 bytes
SHA-256: ebe5e8fa874fa1642ba6c44b576325494249113a832b048b4b26d37c4a227ca3
font_01_sfnt_off00010fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD7 11040 bytes
SHA-256: 3912f1bdea87909d44e978fd11c0b2c5c7dda8c707073dcc3f56a7ef06e3dad3