Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c1c6636b389cb8…

MALICIOUS

PDF

135.6 KB Created: 2021-04-30 16:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1353dd53480ef95fb6df12f7faef9ec SHA-1: 4a11fa45e6af66ce21aefd9adc46f4f5863e9aaa SHA-256: 59c1c6636b389cb827b5a3d10b3ec4c71f81a5b5aeafdffd51f1900cb38c5bd4
96 Risk Score

Malware Insights

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

The file is a PDF document that contains embedded URLs, one of which is identified as malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to strength training exercises, directing users to the malicious URL. No scripts were extracted, but the presence of malicious URLs and high detection scores suggest it's a phishing or downloader attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=what+are+the+different+strength+training+exercises
    • https://cdn.sqhk.co/wanolugago/FFgdTie/febakedomologusoruleromi.pdf
    • https://cdn-cms.f-static.net/uploads/4388814/normal_60354472300be.pdf
    • https://cdn-cms.f-static.net/uploads/4419437/normal_5fe6e030e8b67.pdf
    • https://cdn-cms.f-static.net/uploads/4365662/normal_604503cf6348e.pdf
    • https://cdn-cms.f-static.net/uploads/4403262/normal_6018b60809074.pdf
    • https://cdn.sqhk.co/kigoxeni/hd333QH/dead_city_choose_your_story_interactive_choices.pdf
    • https://cdn-cms.f-static.net/uploads/4481830/normal_5fd8c07c4c627.pdf
    • https://cdn-cms.f-static.net/uploads/4482847/normal_604aa8b8f143b.pdf
    • https://static.s123-cdn-static.com/uploads/4387052/normal_5fec8b6927378.pdf
    • https://cdn-cms.f-static.net/uploads/4376852/normal_60587a3cc905f.pdf
    • http://jumbochecker.com/tigefopakiwuvuxevetizebo5w92s.pdf
    • https://cdn.sqhk.co/gexopoku/6hg8JHT/warpath_game_android.pdf
    • https://static.s123-cdn-static.com/uploads/4387230/normal_6007b60d77cab.pdf
    • https://cdn.sqhk.co/jigijobofofa/q5sFijd/melody_holt_new_house.pdf
    • http://bitcoins-profits.com/brain_rules_for_baby_by_john_medina_full_book_download3yguc.pdf
    • https://cdn.sqhk.co/jopuromug/ifjghju/vexoki.pdf
    • https://cdn.sqhk.co/bimolixumotu/rowyham/ravedunabagitifevureb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vasofirida/insect_pest_of_cereal_crops.pdf
    • https://s3.amazonaws.com/sorogamat/kebimix.pdf
    • https://s3.amazonaws.com/bisiku/43860740069.pdf
    • https://s3.amazonaws.com/wibedubosateg/what_to_say_to_your_goddaughter_on_her_birthday.pdf
    • https://s3.amazonaws.com/folexapurilowe/bosch_tassimo_instruction_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d557.bin
a410bef95a721ede070bf041e747917caec828968e6a3567b1b011b8fdaa5277		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D557 5332 bytes
font_01_sfnt_off0001e787.bin
30556f2d858dd136546ee7a6c7878274586ce307f36724742422253608c1722d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E787 11980 bytes

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