Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c2d29d0c5e3370…

MALICIOUS

PDF

127.1 KB Created: 2021-04-10 18:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d7bf3613852c66a35b3a4dbc01f4992c SHA-1: faed6b4f2ea4dd6e08a48c63b389d51291e0496f SHA-256: f5c2d29d0c5e3370b11a4acddc4ef978a2881de1490531cda81f2f429e40aeb9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the structure and numerous external URLs suggest it's designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://nipisod.ru/strik?utm_term=yashica+mat+124+repair+manual PDF link annotation
    • https://kotaziwusene.weebly.com/uploads/1/3/4/7/134775081/503600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428078/normal_60282408477b6.pdfIn PDF document text
    • https://cdn.sqhk.co/mudemodox/Qqhh2ox/64775918102.pdfIn PDF document text
    • https://gegovowazuravas.weebly.com/uploads/1/3/1/3/131398401/8929629.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/0Miatv3/68642771456.pdfIn PDF document text
    • https://cdn.sqhk.co/xalesikozip/Yidjjhh/research_analyst_job_interview_questions_and_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449783/normal_5fe3315f6af5f.pdfIn PDF document text
    • https://pulapafux.weebly.com/uploads/1/3/0/8/130874232/caefd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375909/normal_603f925212732.pdfIn PDF document text
    • http://suxusojifuf.iblogger.org/7755450853.pdfIn PDF document text
    • https://cdn.sqhk.co/motulobugaji/55hhgiI/parrot_bebop_drone_skycontroller_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/penazavoxu/ieib854/can_you_get_acrylic_nails_done_while_pregnant.pdfIn PDF document text
    • https://tevupiju.weebly.com/uploads/1/3/4/8/134865653/wowuput-xesozurus-ralelofaw.pdfIn PDF document text
    • https://cdn.sqhk.co/gumorefose/bjfDDgj/45838165064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464053/normal_6012620a64286.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wafowudu.epizy.com/13505600082.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/wodedajofodefaje.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/pomexaxizavimev.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/fokexilowal.pdfIn PDF document text
    • http://kakoxoduruze.epizy.com/58696718256.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/bteup_result_2017-_18_marksheet.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_off00019fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FB6 5404 bytes
SHA-256: 63a1981312e0830f783c688549bbe98faee54b3cecf499d940206a1c1b1f3871
font_01_sfnt_off0001b1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1FE 11832 bytes
SHA-256: 12de63926bac336074121056daf770a2d2c812e988643e3bd58a54251e7c90a4
font_02_sfnt_off0001d9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9F1 16136 bytes
SHA-256: 836ab3fafa1d23e35e14e192ec86be8fe8e931eee4b8c79d5c7bf23088570f18

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