Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b8df8b3a8507bb…

MALICIOUS

PDF

92.6 KB Created: 2021-04-04 07:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 666da27247b04441968a41e3898b6b96 SHA-1: bbd25de4ae9434f3a20fc95cbb0ff7385ef50e33 SHA-256: 81b8df8b3a8507bb7f2f5958136eeb3881339e1da05adf85ceb295e85d0afa0f
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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to a book synopsis, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://nipisod.ru/strik?utm_term=after+we+collided+book+synopsis PDF link annotation
    • http://nowefewafugaki.iblogger.org/begeda.pdfIn PDF document text
    • http://nupewijanetari.medianewsonline.com/never_stop_learning_ayman_sadiq_free_download.pdfIn PDF document text
    • http://puxelasuwo.22web.org/zadavusijalesalam.pdfIn PDF document text
    • http://sifiridukujofa.22web.org/old_english_alphabet.pdfIn PDF document text
    • https://tetagusupawuwag.weebly.com/uploads/1/3/4/5/134586179/0a4fbd0aecb37a7.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/sony_fs5_2nd_hand.pdfIn PDF document text
    • http://xugilerasifoveg.22web.org/the_heiress_chinese_drama_ep_13.pdfIn PDF document text
    • http://sezituza.66ghz.com/43053130784.pdfIn PDF document text
    • http://rezumitisud.mygamesonline.org/19015952547.pdfIn PDF document text
    • https://bidijogez.weebly.com/uploads/1/3/5/9/135993355/9ab666c65fe.pdfIn PDF document text
    • https://dokegofixak.weebly.com/uploads/1/3/0/8/130873830/5118523.pdfIn PDF document text
    • https://rezezeveg.weebly.com/uploads/1/3/1/8/131871466/7099641.pdfIn PDF document text
    • http://saniwofixapu.mygamesonline.org/cadaver_anatomy_book.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/sasufufa/69981076228.pdfIn PDF document text
    • http://wetoxisifogif.epizy.com/popimoj.pdfIn PDF document text
    • http://birukuf.onlinewebshop.net/13550768592.pdfIn PDF document text
    • http://somizifiwij.epizy.com/face_recognition_system_ppt_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/49881486767.pdfIn PDF document text
    • http://sudexixurijaxoz.atwebpages.com/ncert_accountancy_book_class_11_part_2.pdfIn PDF document text
    • http://penobugixova.atwebpages.com/4_pics_1_word_level_235_answer_5_letters.pdfIn PDF document text
    • http://tedijafubivot.epizy.com/zesiw.pdfIn PDF document text
    • http://zulolabopel.myartsonline.com/alternating_current_machines_by_puchstein_and_lloyd.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/ham_radio_deluxe_manuale_italiano.pdfIn PDF document text
    • http://lawaxisagiwog.atwebpages.com/english_bad_words_list_with_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/lokafujifenezalalini.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC5 5324 bytes
SHA-256: 59b31d324b523fbc26b31a74f50b11755a22a4e5f1668ad172ea1254877b39f3
font_01_sfnt_off00013007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13007 1884 bytes
SHA-256: b45c62d5613ddef6e7e0f70851ad0cdbca2410a55d14d40e71b7f596dccccee6
font_02_sfnt_off00013929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13929 12144 bytes
SHA-256: 176e38044cfed70ac53dfaa6d6680cb5062cfd7c9c15d0a1228fc287960a03f2

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