Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa92f9fbb2e0f1c…

MALICIOUS

PDF

99.0 KB Created: 2021-03-15 04:54:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a00ef033ef5b43ec7bca08fd4cc0e2b7 SHA-1: 994cbdd8e33b7667443ebfa48db90d3ef29c0da5 SHA-256: aaa92f9fbb2e0f1ca98e5950280615cb42b15b0b0d5f528893310431b977b093
186 Risk Score

Malware Insights

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

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 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/wix?keyword=cm+launcher+theme+apkpure PDF link annotation
    • http://fbdirect.site/pidamara9s5k4.pdfIn PDF document text
    • http://daddytestit.xyz/fotizapolagcx7st.pdfIn PDF document text
    • http://50off.pro/golf_battle_cheats_2020loq61.pdfIn PDF document text
    • https://cdn.sqhk.co/fowujizul/hhvMlAf/variable_color_temperature_led_bulb.pdfIn PDF document text
    • http://manidat.sportsontheweb.net/how_to_brainwash_yourself.pdfIn PDF document text
    • http://erkutungotu.com/wifiwujhenln.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/idJRgl5/jijakipafisebipe.pdfIn PDF document text
    • https://cdn.sqhk.co/tofatuxurejo/hiT2hag/pearl_store_hawaii.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_8caa99c84e2a4c20a0f30d9236badcb5.pdf?index=trueIn PDF document text
    • http://nakarajibap.myartsonline.com/family_photo_photographer_near_me.pdfIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_484b79c98b6a490aa9cb61bbe9f83b2b.pdf?index=trueIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_e6721de5430446bf9c4b990c49f576ae.pdf?index=trueIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_35b528b958cf48f0a3410de85cfa447e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7529e6ab-6d7e-4284-adb5-e9da58d68825/how_to_put_bobbin_in_brother_cs6000i.pdfIn PDF document text
    • https://8772a198-af03-49ef-8724-5feb7546cb8a.filesusr.com/ugd/436f04_7d3c50867cee4b6aa69be81b0afba1ac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7777d0c9-e004-4d51-9954-00cc289f7f8d/subtraction_worksheets_for_grade_2_with_borrowing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a5039f1-cfe2-4023-b68a-6bd3f211fa2a/womipal.pdfIn PDF document text
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_bd130cfb472a4cbca8adfc4f4fe90a37.pdf?index=trueIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_f37e96dc9d1e4e54a1c51cab76fba7ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/07012f7b-9af5-413a-9eb5-8a568af6d702/descargar_la_biblia_catolica_en_audio_gratis.pdfIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_b50290a1c834477292124baf7a226646.pdf?index=trueIn PDF document text
    • https://c3bb11cb-ba02-405d-8462-2b4421b436e1.filesusr.com/ugd/4c7814_dfb4eec90c8347e2a45e43de4a1f97ba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d8b2e82-638f-41fd-b4c8-aa0106881fed/mugosepe.pdfIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_9546163081504e1393217e910937407e.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 4964 bytes
SHA-256: cd37153f226ddc96907e3734117bf506f5ece0b19f1c8299836447d1f9b043f3
font_01_sfnt_off000104c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C6 14476 bytes
SHA-256: beec87dfa3522f86366c6ab9076e605cf0c6ed23b20c274159f67b19f5016aa3
font_02_sfnt_off000132bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BD 22032 bytes
SHA-256: 28ae9486a90a183ce0c4e0cfecdf247cc3d2b4c50489283664af5bb8d9d01970
font_03_sfnt_off00016661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16661 16264 bytes
SHA-256: 00e5034bf99f3d6efe00a25a3bfa276cf159795ad76b0562490920772022da12