Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7728f709dc7f97…

MALICIOUS

PDF

82.3 KB Created: 2021-03-17 10:44:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ec9242c5ad693a0feb7733732099a44f SHA-1: 1b6c50546bd95625f03f13a334e5c86993741c51 SHA-256: 1c7728f709dc7f9793f693a21aa69876fd3de4114717e769e8db28f14e406b92
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO-based phishing campaign. The document body, though heavily obfuscated, contains text related to a dictionary, likely a lure to attract users searching for such content. The embedded URLs are the primary indicators of malicious activity, likely leading to further malware downloads or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/award?keyword=oxford+advanced+learner+s+dictionary+9th+pdf PDF link annotation
    • http://wejnpowk.space/ssr-_ep_125_manualwkx6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464315/normal_5fee84a5b5f34.pdfIn PDF document text
    • http://options.expert/928797838584im0.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/ark_survival_mobile_beginner_guidex8ze4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485823/normal_5fdcc5d759824.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/hahgjdq/candy_crush_saga_gameplay_android.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/ahjopgb/lugup.pdfIn PDF document text
    • https://cdn.sqhk.co/xojoreve/ggZ92ii/80717872489.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/gDSa1QY/pet_rescue_saga_on_facebook_not_loading.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutowede/HGgeggf/zowedasazonadatuzagupi.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/gcgggiA/pick_me_up_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/nufomewo/f9W3ijS/3_movie_sad_music_ringtone_download.pdfIn PDF document text
    • http://familyit.pro/gokevipotutanupojaxo6phdx.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/0dBzjg6/magic_motorsports_tuning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473947/normal_603c76476548f.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/Tidjjie/63539389734.pdfIn PDF document text
    • https://cdn.sqhk.co/zimogemage/Oicjhgf/xexip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_59a234734f0c4c86b63ae2553fda58d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb6ed3fa-ed33-45b2-a7a4-c3e87ba324e8/what_are_recreational_activity.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_9a3d984dcc6245399806ca005d2a6f52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be1d3ddb-63ad-4536-8344-59afabe5840d/2004_honda_civic_ex_service_manual.pdfIn PDF document text
    • https://65fca3b3-7ce8-4d56-9bc8-ebe46cc5223b.filesusr.com/ugd/f6ed72_43aa6d1112454505b2d449d1ae468200.pdf?index=trueIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_136a02e32a99429d8ab3c3a5e4d855da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ef85cc7-4e0f-4d9f-b1b3-c583e5112da6/how_to_replace_whirlpool_front_load_washer_door_seal.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_off0000fba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA3 5656 bytes
SHA-256: f8e0de3fad5b1ed8d94b5a9b8f51f19aee03f383f36b2f6a900fd1893c21e8f7
font_01_sfnt_off00010ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE4 13568 bytes
SHA-256: 94f10d4ec5a2e39d07c35e7ac4b8161ddfdf498386a2eedd2e8a1e559e7363c9