Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe948dbfa028cdc6…

MALICIOUS

PDF

72.4 KB Created: 2021-04-02 12:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c18f692eebd0d7b90e9ec72ed7cd2761 SHA-1: 14da669653d1fd648be5705b0b0b45e1ad6ba429 SHA-256: fe948dbfa028cdc62a55f983d7300f3a5671fcc6562fe047347ca1d563e85df7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/strik?utm_term=barron%2527s+sat+premium+study+guide PDF link annotation
    • http://maska-respirator.com/wipamoposazamisamadr2e68.pdfIn PDF document text
    • http://forkidsshop.online/walmart_tv_stands_in_store8itg5.pdfIn PDF document text
    • https://cdn.sqhk.co/zivugeri/RO9gFje/car_gear_shift_knob_custom.pdfIn PDF document text
    • https://cdn.sqhk.co/gepabafi/z2XqgjV/5666701162.pdfIn PDF document text
    • http://complerbnp.com/12431695005brzqm.pdfIn PDF document text
    • http://svoylend.xyz/bits_pilani_dubai_application_formk3id5.pdfIn PDF document text
    • http://kexevosizamem.iblogger.org/anatomy_upper_limb_textbook.pdfIn PDF document text
    • http://ihsteam.ru/xaniwowagizilujojanunrxeds.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/hagigiQ/free_business_plan_sample_word_doc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://df1d5e35-4e67-4e57-ba41-6141a32c4ecb.filesusr.com/ugd/c54278_f7066272d93d4ef390bd9f4d18cb8ef9.pdf?index=trueIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_fca4febdc8bd4e879a9ec8b349d34edb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/94970cdd-56a3-4a0e-87d1-e58a39fd8a42/acorde_de_re_bemol_en_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9b3a551-7297-464f-b8b4-0b1dd9cbd68f/xonufurobefijux.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_dcf91108d18f4cda81ac4bbea66f648e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f218650a-f644-4125-be79-cd0abfcd99f4/34253116737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4aac343-0784-4897-b9e4-cfddb5afcbc5/how_much_does_it_cost_to_replace_a_motherboard.pdfIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_9ce79083a3864d6bafd2be4229ef4c9f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aad23ce-6394-4f3b-905a-dd50c3a75978/calories_in_dunkin_donuts_mocha_swirl_syrup.pdfIn PDF document text
    • http://bifezuragumizi.rf.gd/xodobulaxenaxiguwowebivek.pdfIn PDF document text
    • http://jetijawutapa.epizy.com/xasizog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7ab5bb7-d4fc-4c79-8ae7-ab07d0684d9b/regolodavakunitegore.pdfIn PDF document text
    • http://wowawese.rf.gd/blender_player_model.pdfIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_1320e2ec51fe480ebe3fe2669886167e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fac9155c-9fc4-40c4-be9d-e42a91d23ce1/hodgdon_load_data_5.56.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10fa86d9-8bff-4016-bc62-2486bd13c0b9/27784685074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e61482d-3762-48eb-a341-81053bd96f24/rationalist_explanations_for_war_james_d._fearon_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6beb221f-4075-4e64-90e4-a846fc4e30f3/71740834339.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_off0000d6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 5432 bytes
SHA-256: 6a70730044bec498058bec703ab37835d0e07433f79e6b75ba7b96f01d98ed9d
font_01_sfnt_off0000e93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93B 15044 bytes
SHA-256: 0b71573bba477813661c0aac8f2597bdb280f0dc0a42c8dd04399ade07e8f0fb

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