Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b4170353655dc7…

MALICIOUS

PDF

95.6 KB Created: 2021-03-19 03:22:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 12b409323d19fe46237851353014ff85 SHA-1: bc165900d7e8ea9ad807ee3f58411dd6cd064d11 SHA-256: a1b4170353655dc72769d6b48a5092d75675db6ce415d9295f80cb1475303ae0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to search keywords, further supporting the lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/wix?keyword=realidades+1+capitulo+2a+chart+answers+page+31 PDF link annotation
    • http://novazeku.mygamesonline.org/que_significa_el_poema_espero_curarme_de_ti_de_jaime_sabines.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/Tyggifw/rirebawutigawogixigi.pdfIn PDF document text
    • http://jelusuvobirolen.mywebcommunity.org/dodubusixotuwus.pdfIn PDF document text
    • https://cdn.sqhk.co/lazimafuxuxi/iaiadql/razetat.pdfIn PDF document text
    • http://iclod.tech/ecdl_module_5_sample_test_answers7t7o6.pdfIn PDF document text
    • http://nifazafagikoxa.medianewsonline.com/wild_game_camera_pictures.pdfIn PDF document text
    • http://worozoxiw.sportsontheweb.net/tumidiruxatutonekimaw.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/hhIhji7/free_live_wallpapers_for_iphone_8_plus.pdfIn PDF document text
    • http://ceter.xyz/united_colors_of_benetton_origineb5yg.pdfIn PDF document text
    • https://cdn.sqhk.co/wemigiwim/o6Ax1Ul/satanufuvibemuguzipezo.pdfIn PDF document text
    • http://vorecan.fun/5691735010993n27.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff366fda-cde0-4b3b-b256-8a43afed25ec.filesusr.com/ugd/b3318b_c5fd93872e404928876116496d0cd784.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ccc6475-21b1-4451-bf76-a9c03e417240/philips_system_one_humidifier.pdfIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_0130e76092f44981b263e9eba8394d61.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_93b8002549f44a01a2f7ab38f8cbec6f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2765ffb7-3089-40da-8267-68255f5e2ded/pofeloximizigusugesefiwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f31dd2-5ebd-46ff-b492-b2eeb2ed698f/nurse_manager_interview_questions_and_answers_uk.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_57081b7fb64b4c51b14729395bdbc84e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dd1c6e5-d264-40b0-842d-ea332affc879/selerijurumajewip.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11744 5780 bytes
SHA-256: 3eab2ae4e345b267f5ad8945009034992fd8c97b7371e6685905d0ad743331f1
font_01_sfnt_off00012b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0A 14484 bytes
SHA-256: 90c7f60c047801f152244b80b5d58f7b980dc5455514bccacad2f1be6fc6281a
font_02_sfnt_off0001596d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1596D 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449