Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec4098f4567226c…

MALICIOUS

PDF

81.8 KB Created: 2021-03-18 18:25:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6f207c6ce3ce4d0142e04dab550700b5 SHA-1: d4ac9cd5ec4229f5893e60d154d5d3c96274af11 SHA-256: 3ec4098f4567226ca43555cd252c86cd0580e06f0779c5f14dbdddfddf809f0d
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains a significant number of external links, many hosted on disposable domains. This indicates a link farm or SEO spamming operation, likely intended to direct users to malicious content or phishing pages. The presence of PDF_CAPTCHA_LINK_LURE suggests a lure related to CAPTCHA verification, possibly as a pretext for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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://jacksth.ru/strik?utm_term=emotion+thesaurus+fear PDF link annotation
    • https://cdn.sqhk.co/sutekepape/YNPcBPW/wordpress_login_plugin_captcha.pdfIn PDF document text
    • http://fasigirer.iblogger.org/31590915516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377380/normal_603cfa757e019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487194/normal_6039578d61081.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/tZUMjcX/in_the_rooms.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382620/normal_603cbb3b66f28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454054/normal_603f3ef29b6a6.pdfIn PDF document text
    • http://fixalab.22web.org/tnpsc_app_exam_answer_key.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369343/normal_6043c2e6d69b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_bcd0906580364af59ccc2c41efb8b0cf.pdf?index=trueIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_6a0cfd76af0b42738ea3d7e2b0aa96ad.pdf?index=trueIn PDF document text
    • http://vovajixavago.epizy.com/year_3_maths_sheets_uk.pdfIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_27b8a997dd544fc8b8a2c4f1d3bb3022.pdf?index=trueIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_64308c0b63b6487b9c19a58ab7d94da2.pdf?index=trueIn PDF document text
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_8c7b899da46e48e3a26a4f7bfef18754.pdf?index=trueIn PDF document text
    • http://gafiruxosu.rf.gd/how_to_use_harman_kardon_onyx_studio_4.pdfIn PDF document text
    • http://dufeniwa.rf.gd/pexigovira.pdfIn PDF document text
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_c681d372406a4b7086489ed23f20ebad.pdf?index=trueIn PDF document text
    • http://rimuvuvipimube.epizy.com/fuxepuz.pdfIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_d4cabe25e41147d38ee264925733c116.pdf?index=trueIn PDF document text
    • http://mepumubim.rf.gd/what_is_a_womans_role_in_a_mans_life.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 4812 bytes
SHA-256: 4e286d19d8243c9695872fe83eba25b915aa79fe4868fa206a6b159dfa387646
font_01_sfnt_off000106fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 10672 bytes
SHA-256: 20618f9154b7e133707bc1bf1170a9dfb4e84f227df1b4778a27e7c4f9cd8468
font_02_sfnt_off00012b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7B 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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