Malicious PDF — malware analysis report

Static analysis result for SHA-256 2355b2da2fbdbc1a…

MALICIOUS

PDF

78.5 KB Created: 2021-03-07 02:54:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cbcb20265874b5fe3aa58da9cf9f4416 SHA-1: 8f5bce81c1c016189a117baac78d276d8fc0b4b8 SHA-256: 2355b2da2fbdbc1a667dc60dfddced882cc41b34b92c69a00f43bdcbd3a86c68
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a phishing or SEO spam campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/strik?utm_term=pair+tp+link+av500+with+av600 PDF link annotation
    • http://vulgargirls.fun/mobile_suit_gundam_micro_wars_3rim9u.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/power_air_fryer_10-in-1_pro_elite_oven_6-qt.pdfIn PDF document text
    • http://setlyb.online/zetazovisozugolugevonudzraq6.pdfIn PDF document text
    • http://bowabemolova.22web.org/lesiponorulute.pdfIn PDF document text
    • http://olymptrade.buzz/marakofavumapkq.pdfIn PDF document text
    • http://wodedutipif.medianewsonline.com/sozalozajatukotepumu.pdfIn PDF document text
    • http://miwewumexurigan.sportsontheweb.net/giraffes_cant_dance_lesson_plan_growth_mindset.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/rules_of_the_game_summary_sparknotes.pdfIn PDF document text
    • http://gonaxepafa.iblogger.org/revuwufajufixunowisozonut.pdfIn PDF document text
    • http://fruit-citrus.space/vital79ro0.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/b7d1acf4-8473-40cf-aeb8-0189612041be/learn_how_to_read_chinese_online_free.pdfIn PDF document text
    • http://jinonepi.epizy.com/dajodaviwopepakagewet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2d8c54b-af19-4cc1-9b67-32d8c143ecf0/sigmund_freud_psychoanalysis_quotes.pdfIn PDF document text
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_a5cf2d000eb0419d899e18a197ef187f.pdf?index=trueIn PDF document text
    • http://lojokedasu.rf.gd/icarus_and_daedalus_answers.pdfIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_39a65ca2c1da431a9a797fa16a437870.pdf?index=trueIn PDF document text
    • http://ditipeso.epizy.com/tikonadijeputipapewaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06026db5-c34b-475c-9262-6e8c6fa886c4/black_and_decker_18_volt_lithium_battery_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/148abc70-95bc-46b6-9504-43a5912d21af/nujigezekililuxifi.pdfIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_ccc78e6bd3674ae880a92dc78c95d26c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e66c873c-0ec3-478c-a580-8c680cba9731/46296746368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30cc42a1-8355-45dc-ae2f-a330f073d1f1/nowoxasoba.pdfIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_f2f21aa438fc478fbb8c3fab63c523d3.pdf?index=trueIn PDF document text
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_6f8b9e94e5894f6181d7f30a0b6f1d74.pdf?index=trueIn 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_off0000e8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 3588 bytes
SHA-256: 1eb256cf3e4eaeeb1f4eeb793bbb50f4d2b5617a7e20b5ea010dbfa1fe87660b
font_01_sfnt_off0000f593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 5364 bytes
SHA-256: 084c54358504473e303e03c61c127ba66e64a950a44d933b2a9dd6549f1fbdca
font_02_sfnt_off000107e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 10716 bytes
SHA-256: 582bae3528d2a4943f1631b7136559fb26cab96d817b55127035f6de792949a3

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