Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3a899fd2dfa658…

MALICIOUS

PDF

76.2 KB Created: 2021-03-22 06:00:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: fae2ee406ab284d2ccd2789eca98a76d SHA-1: 307d1d84130119aa7485faca6655a4a95ceaaecd SHA-256: 5a3a899fd2dfa658dd4956ba3cb3a00540f812c3fed9697d9dc8295e6ab25c78
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or scam campaign. The document body, though heavily obfuscated, contains keywords related to academic answers, reinforcing the lure.

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://vilenefex.ru/wix?keyword=rotational+dynamics+lab+answers PDF link annotation
    • http://fogatevemawe.22web.org/when_will_dbz_kakarot_get_dlc_3.pdfIn PDF document text
    • http://jokafoziber.22web.org/que_es_ciencia_en_metodologia_dela_investigacion.pdfIn PDF document text
    • http://wozekozexufoxol.scienceontheweb.net/58482633927.pdfIn PDF document text
    • https://petenugilamabo.weebly.com/uploads/1/3/1/4/131453278/2581449.pdfIn PDF document text
    • https://xobagesimijuvu.weebly.com/uploads/1/3/0/7/130776740/181110.pdfIn PDF document text
    • https://xizidalubatud.weebly.com/uploads/1/3/4/5/134583516/badelolol.pdfIn PDF document text
    • http://jomikifu.medianewsonline.com/ielts_academic_vocabulary_list_of_words.pdfIn PDF document text
    • http://gumovuf.22web.org/tusekegularetu.pdfIn PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/lexupinumep_nokabilojuvaki.pdfIn PDF document text
    • http://wusazododapir.iblogger.org/70345305204.pdfIn PDF document text
    • http://nafepuzemobir.sportsontheweb.net/duwomobujevutolomat.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/janodojivi/7229390452.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/differential_calculus_for_beginners_edwards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/797f15ef-d860-40b9-bcc4-85811f3a20ed/23836858322.pdfIn PDF document text
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_db1128e62bdb44518732c685b48ad169.pdf?index=trueIn PDF document text
    • http://sizemogigu.myartsonline.com/app_to_convert_into_word_file.pdfIn PDF document text
    • http://davofunup.onlinewebshop.net/sivegifabejumoxanit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b606863b-7098-47ae-8a88-a7302b540410/botejetixuxabikexibimudal.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_73f0883757ac46f2b24a2dfc566a32c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7ebc75b-61de-48be-b87f-34dc6b2c9eee/what_type_of_charger_does_a_kindle_take.pdfIn PDF document text
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_a1a273e25f2e4ceca7cd16b2950746b9.pdf?index=trueIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_9e58914d4cdf48fc98cb70049b19b9d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/lumumokuvo.pdfIn PDF document text
    • http://serovim.epizy.com/aptiom_drug_information.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/5433455188.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_off0000ea30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA30 5428 bytes
SHA-256: 56be38693630c2362abd87ee8a0b7d88705f852de10fde79c7d0e3305b6585e8
font_01_sfnt_off0000fca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA5 11436 bytes
SHA-256: 7d1e9ca621b61ae314d6b273f14374654ca1ae9d27ec278286e2c6c1c0d2b4b5