Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa50edd6c9601464…

MALICIOUS

PDF

96.2 KB Created: 2021-01-23 00:52:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f08734c332811f9ba8c95aca57975895 SHA-1: a1a26abc99cad9ce4c6a55f6d0a5a42b7ab064ea SHA-256: aa50edd6c96014649174333fde566960ba7b9d82169a36a22075b46f02af90e4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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/aws?utm_term=oxford+reading+tree+stage+1+pdf PDF link annotation
    • https://site-1174141.mozfiles.com/files/1174141/world_war_3_movie.pdfIn PDF document text
    • https://site-1252280.mozfiles.com/files/1252280/ditivawaludirusul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381321/normal_5fec5795adc9d.pdfIn PDF document text
    • http://fogimikolasot.iblogger.org/jizefazu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387433/normal_5ffd7e1e97485.pdfIn PDF document text
    • https://site-1172428.mozfiles.com/files/1172428/30292504041.pdfIn PDF document text
    • https://site-1172798.mozfiles.com/files/1172798/kejusunadexezedaroxeno.pdfIn PDF document text
    • http://raxuzogigegekaj.66ghz.com/relaxing_morning_music.pdfIn PDF document text
    • https://site-1171554.mozfiles.com/files/1171554/quotation_template_excel_2010.pdfIn PDF document text
    • https://site-1174218.mozfiles.com/files/1174218/15569546673.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454045/normal_5febda555ac6c.pdfIn PDF document text
    • https://site-1171722.mozfiles.com/files/1171722/20858688790.pdfIn PDF document text
    • https://site-1177779.mozfiles.com/files/1177779/today_s_forecast_for_chicago.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/nulavawuvefixowenifur.pdfIn PDF document text
    • http://zixadadafupeg.epizy.com/buxulugodup.pdfIn PDF document text
    • http://banugigo.epizy.com/88315224897.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000d55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55A 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off0000e63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63F 5324 bytes
SHA-256: c999567c74d486806ffe0a5a24277ff8f6fa3af13eeec93cc255c73e921904b8
font_02_sfnt_off0000f871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF871 12360 bytes
SHA-256: cef8a27096741c618947b21db8bbfa17dab91b3b19254ec14db0920a4adcf0a5
font_03_sfnt_off00011ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFB 7280 bytes
SHA-256: 6f383abdcee01c9b5f3dee643b6f015ea2383abf922881377820c367fd48c935
font_04_sfnt_off000133f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F6 12076 bytes
SHA-256: 25fea7c488ed0faedbe3f2fa952afefe471f3fea7f4c537c58ecd3deaf49940c
font_05_sfnt_off00015be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BE3 16352 bytes
SHA-256: 9fc04586aa88a4e53c892cabca297a4361e400b2130b803b6900313538173801