Malicious PDF — malware analysis report

Static analysis result for SHA-256 67140c13a99f389a…

MALICIOUS

PDF

70.8 KB Created: 2021-03-22 06:02:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c1fadec0b916d09056ea5573dee3646a SHA-1: 69ca0c1d26487b93d495d3992c72c69aeffe3eb9 SHA-256: 67140c13a99f389a43905568589e620554a49b47ff663e0e055e72705abaff5c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via the linked sites. No scripts were extracted, but the PDF structure itself is weaponized to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=chem+161+lab+answers PDF link annotation
    • http://makeyourself.xyz/fusagusifobonugado8v0s5.pdfIn PDF document text
    • http://yogistika.space/crazy_craft_pe_modl2gnb.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/cgcGhhA/pimepadalazupili.pdfIn PDF document text
    • https://cdn.sqhk.co/remigalakefo/jhqAshh/xizowamejakosi.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvinudubuno/xMOiaia/boketedebatete.pdfIn PDF document text
    • https://cdn.sqhk.co/gupetipek/Jgdhhhd/46405196611.pdfIn PDF document text
    • http://pokupka.space/xiwoluredabowoluvuvulut5m9m3.pdfIn PDF document text
    • http://bubobimurasawe.iblogger.org/grimm_brothers_original_fairy_tales.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_97195add9dd24a8c93fd4a59b9c50017.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xurixado/label_landforms_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/anhalteweg_weg_faustformel.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/cnbc_fast_money_halftime_report_twitter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbe9a093-9766-4717-ac0e-e4f88d927602/90645847882.pdfIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_c28b5c8b9c3647348a5b9a31072f8383.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/rabemuzid.pdfIn PDF document text
    • http://xowomowipuzu.epizy.com/sync_3_android_auto_update_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fa9183c-3490-4700-86d5-e8374095517a/can_i_convert_powerpoint_to_keynote.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_off0000d70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70A 5268 bytes
SHA-256: 85f63bbaee4550c43a4420006dc165ac3196ed30ed428cd8b8fe6abf5f8dcc49
font_01_sfnt_off0000e8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D6 11056 bytes
SHA-256: 10db75c725abf26f29a314cca4d0b7ecba3caf84c8de5617cd40f33637e23bac

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