Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bed728c59805015…

MALICIOUS

PDF

136.5 KB Created: 2021-03-15 19:40:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b6ac41246226757109ada336b0a69c3a SHA-1: 2b1876839ba96d0a8fde939981d43207ac2c9ee2 SHA-256: 9bed728c598050156fc29722def0ecd59aa55618e59be5142e0c99c2e0dad1fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to a 'Korg triton prox 88 manual'. The primary malicious activity observed is the redirection to external websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://jottigo.ru/wix?keyword=korg+triton+prox+88+manual PDF link annotation
    • https://zekawumili.weebly.com/uploads/1/3/4/4/134403966/8636774.pdfIn PDF document text
    • https://cdn.sqhk.co/nipigagavadu/bDUhjcO/63459175585.pdfIn PDF document text
    • https://muxasikij.weebly.com/uploads/1/3/1/8/131872285/6089983.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377674/normal_5ff2a0e83a321.pdfIn PDF document text
    • http://fanutoragozogow.sportsontheweb.net/vivanugozu.pdfIn PDF document text
    • https://cdn.sqhk.co/likamigid/ehdjigh/marvel_runaways_season_3_episode_8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412151/normal_60332831dc275.pdfIn PDF document text
    • https://vulefewaxamovu.weebly.com/uploads/1/3/3/9/133997320/5602595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459174/normal_5fd6a0ee5b970.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384045/normal_5fce225e2a6b8.pdfIn PDF document text
    • https://wovovude.weebly.com/uploads/1/3/1/3/131397940/winaxilisazuta_xagetosolupufar_koxasaxisunutif_majup.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/maxasiliru-kazamivek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416493/normal_5fe2ca2712e5a.pdfIn PDF document text
    • https://cdn.sqhk.co/zimidenex/1hMhbif/xasixutak.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/jjghhgv/baby_name_generator_quiz_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/zidezofa/ahhjgmQ/48672298397.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vekamodadon.onlinewebshop.net/spoken_english_learn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a880424-b317-4a7b-84a4-a472225f316b/tv_element_elefw195_led_hd_19.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/sirifufufeguvojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/180935c5-c862-4b75-8d53-75969effd31d/how_many_red_face_cards_are_in_a_deck_of_52_cards.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/kexunepizizuduvisegu.pdfIn PDF document text
    • http://kepagewav.atwebpages.com/knowledge_domain_cleric_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/49714824708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e33cd9df-cbd0-432a-ad2f-365e77d578de/cules_son_los_23_pases_que_hablan_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eae534f5-319d-4a6b-b2b7-7337bb2d6a67/how_to_open_a_sentry_v260_safe.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/brahman_naman_movie_in_hd.pdfIn PDF document text
    • http://sizemogigu.myartsonline.com/excel_formulas_list.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_off0001d83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D83E 5192 bytes
SHA-256: 68ebc94bdf2ab5e962a30c33028d1a3f21b796e5bc4ae9cd85065eb220002768
font_01_sfnt_off0001e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9DD 12712 bytes
SHA-256: e9356388e3e32fc352f8999f406043b6d3f7566444464b5d608e2a8ccb81fbdf