Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c50e6e6b3d6fcd…

MALICIOUS

PDF

108.5 KB Created: 2021-04-11 13:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 96b46547216aaab050c153e4c184baa5 SHA-1: 1d943b891f08d0acda95996eaeedf521dd3c0b9a SHA-256: b5c50e6e6b3d6fcd58856e84aa488d1306b90c56b12985ca6b1de03f42187543
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://dugedepap.ru/strik?utm_term=is+the+hating+game+a+movie PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408476/normal_5ff5d80c5e6ae.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/fjg8F9q/22107220820.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466666/normal_5fdede2d00c7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368782/normal_60566292c2824.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/cNQMhhP/lucky_block_minecraft_ps4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_6017fb3783933.pdfIn PDF document text
    • http://larekew.mywebcommunity.org/centrifugal_clutch_working.pdfIn PDF document text
    • http://xuzotudaraderuf.mypressonline.com/29151982629.pdfIn PDF document text
    • http://fedexonep.mypressonline.com/common_accounting_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425237/normal_606a7c5b99ba7.pdfIn PDF document text
    • http://fefotuzod.22web.org/23842589805.pdfIn PDF document text
    • http://pusosokus.iblogger.org/sotaxurisa.pdfIn PDF document text
    • http://derifupiwa.mypressonline.com/vizufizubamuwujilu.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/ifzjfbj/ice_cream_truck_rental_stamford_ct.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7b9449e5-51e9-4a7e-81f5-8587c42320f9.filesusr.com/ugd/571bad_084b18ee0af04634b570621059977973.pdf?index=trueIn PDF document text
    • http://mivurekas.epizy.com/arduino_due_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fa1b6a9-c090-40f1-a6e0-ec69a3943ccd/tissot_t-touch_ii_stainless_steel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efb7e16e-e555-4c64-a3fa-02b9d726fcf0/can_you_make_banana_loaf_in_a_bread_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef29a2ff-cbe0-4baf-9943-09b3a7b11d55/the_thran_mtg_book.pdfIn PDF document text
    • http://dipibezepipes.rf.gd/lekokitilelomuruxazuxeg.pdfIn PDF document text
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_fcefd27d9c814f4bba89c5ce8a38c68e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e5af9e3-0e20-4d95-90ae-86c765d64ed6/nugugetovigofabu.pdfIn PDF document text
    • http://pasumogebono.rf.gd/multipart_form_data_json.pdfIn PDF document text
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_b5497270cf5044c29809169606ebf1f8.pdf?index=trueIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_ca20f743b2e24aab8b5a2f92ccd260cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ece7e81-39ee-486b-9f00-9ecb4e494798/nivuguruvubijesilofar.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_off00010b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B04 30540 bytes
SHA-256: 9d07e56fff4b6b4e1ed17ee3cb137f10b47dd0815c58e7de857d6be80bf935ff
font_01_sfnt_off0001697e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1697E 4968 bytes
SHA-256: c8704f942d079b88f6c8d13d0296e85623e912e736664805f9ff4ab74b382883
font_02_sfnt_off00017a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A4C 11372 bytes
SHA-256: e8ac71450902646edbbde46f7fba33af745f2b360d189d06170fd4126fc7b14c