Malicious PDF — malware analysis report

Static analysis result for SHA-256 52bcb68b981068fc…

MALICIOUS

PDF

73.0 KB Created: 2021-02-20 02:49:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2e421eef1d134a4eb331783367014655 SHA-1: 7f54daa91e1c307828a35bac33461ddc78a9587d SHA-256: 52bcb68b981068fc839ee8fbedd4e1876910ae0e04944058ca9ea5b730d7c75b
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism to host malicious content. The document body, though heavily obfuscated, contains keywords like 'Skyworth tv review ph' and 'wkhtmltopdf', indicating a potential lure for users searching for product reviews.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=skyworth+tv+review+ph PDF link annotation
    • http://kepibarufot.22web.org/benny_s_dispatch_sheet_music.pdfIn PDF document text
    • http://xiravudes.22web.org/assessment_report_ipcc.pdfIn PDF document text
    • https://zirefugat.weebly.com/uploads/1/3/0/7/130740019/nutewokinikufesegapa.pdfIn PDF document text
    • http://50offshop.info/93558887959y0dm2.pdfIn PDF document text
    • http://pexukakadom.22web.org/geluvonu.pdfIn PDF document text
    • http://pamuxixa.iblogger.org/c._v_full_form_in_bengali.pdfIn PDF document text
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/7836b.pdfIn PDF document text
    • http://tanidoxipasodot.22web.org/mysql_cheat_sheet_sqli.pdfIn PDF document text
    • http://toteganutiv.66ghz.com/the_penelopiad_audiobook_download.pdfIn PDF document text
    • http://trikolor.site/91788693830tx899.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • http://sutekotuluzuwed.rf.gd/duvaretaxefojelof.pdfIn PDF document text
    • http://gumigojozupe.epizy.com/free_skype_7._38.pdfIn PDF document text
    • http://xetumerim.rf.gd/how_to_interpret_pls_results.pdfIn PDF document text
    • http://jexamovofu.epizy.com/weather_report_cayo_santa_maria_cuba.pdfIn PDF document text
    • http://zuriromaruwo.epizy.com/40631296797.pdfIn PDF document text
    • http://xodupope.epizy.com/vakofekupotinidurasinur.pdfIn PDF document text
    • http://sejofedavija.epizy.com/72469897392.pdfIn PDF document text
    • http://sifebina.epizy.com/16152184636.pdfIn PDF document text
    • http://vetalobaxa.rf.gd/strongs_hebrew_dictionary.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/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9D 4908 bytes
SHA-256: e949280d6c1ef167af499b6cd34d1fd71375d12ba6514bbe0e1339ec530a44ae
font_01_sfnt_off0000e071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE071 8976 bytes
SHA-256: 7e98081f44ff9be21f2be21d17426fa35b07cfbadd26ac3f6cbb691f5ce60abc
font_02_sfnt_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 10684 bytes
SHA-256: 1fa60f9c4b879a1170cc230aa0bd85a69a28961fefcc96ec23de7b8f5edf35cc