Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec58e115699843c…

MALICIOUS

PDF

156.2 KB Created: 2021-02-23 15:32:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 813dfd25addb1976dca631a622b68937 SHA-1: 9dcd7349dcb00e6787101362f7ab064565a350b7 SHA-256: eec58e115699843ca771dc5ab4308d73f447c2b7d3889d92f6f0a4074e0b7bd8
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous links, many on disposable domains, indicates a likely phishing or link-farming scheme. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9732

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=the+count+of+monte+cristo+character+connections+map In PDF document text
    • https://cdn.sqhk.co/tisewesir/igUihhf/64659918098.pdfIn PDF document text
    • http://womukob.iblogger.org/what_are_the_essential_elements_in_writing_of_poetry.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/fbDhb6L/smartthings_login_not_working.pdfIn PDF document text
    • http://bedojipekasel.22web.org/allshare_cast_app_android.pdfIn PDF document text
    • http://xakojudanek.66ghz.com/business_plan_templates_word.pdfIn PDF document text
    • http://vuvatemubo.iblogger.org/38597777561.pdfIn PDF document text
    • http://wokelegekak.66ghz.com/20811526433.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/widetunipet/national_geographic_animals_fighting.pdfIn PDF document text
    • http://gelutusuxipedib.rf.gd/abbyy_transformer_2._0_crack_free.pdfIn PDF document text
    • http://wuselenefoz.rf.gd/48888462182.pdfIn PDF document text
    • http://dupizorof.rf.gd/who_is_the_strongest_vice_admiral_in_one_piece.pdfIn PDF document text
    • http://dutugege.epizy.com/blueskysea_b1w_manual.pdfIn PDF document text
    • http://sokevigaku.rf.gd/integrated_grammar_worksheet_for_class_7.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/erode_district_map.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DB3 26296 bytes
SHA-256: 557648a8f6f4b020070cd15f757d8ec7311cb743a4a4ae0b77e00c7d77487b3e
font_01_sfnt_off0001ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED8C 5172 bytes
SHA-256: 2c9516f229e0d95135832219d2a0e57e2f6f3101915230c3ad7431b44557292d
font_02_sfnt_off0001fefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FEFA 4692 bytes
SHA-256: f2d817c5f3df753f56916a81bf2ae536253c527470e91272faea7b79f7dd787b
font_03_sfnt_off00020f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20F0B 5860 bytes
SHA-256: 03e9f3da46660ede3b087f4c03b5403f8b831b3925df4b1a42cc0b8d6dd856e7
font_04_sfnt_off00021dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21DCC 12788 bytes
SHA-256: 714b0c6b7895679659e0ee295728c2c6437d193dbb6c90479fa78ffafa320422
font_05_sfnt_off000246b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x246B1 17648 bytes
SHA-256: 2d40ae2fde33b65dd5e256efe4bd5496f074af3c20df1d5cedc4126e7f7374a7