Malicious PDF — malware analysis report

Static analysis result for SHA-256 53215bcc52ed8287…

MALICIOUS

PDF

83.7 KB Created: 2021-02-25 09:40:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c1c9e078927ccfa2e67828ffadcac36b SHA-1: 36e6bfdebfda849664807d79628b1b7109590c6e SHA-256: 53215bcc52ed82878d78da51fc0e1990f848d68ecad39bdccbf288cfeaa20e96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=hot+water+heater+pressure+relief+valve+leaking PDF link annotation
    • http://lami-lashes.site/rijonefopubegagi609bw.pdfIn PDF document text
    • http://wilidelefuguki.22web.org/gupigasaf.pdfIn PDF document text
    • http://guitar.su/aaa_logo_maker_crack_free5t8g5.pdfIn PDF document text
    • http://kaxitijidopu.iblogger.org/98318381085.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/1st_grade_math_worksheets_word_problems.pdfIn PDF document text
    • http://xosopinogagon.iblogger.org/44853633284.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/19060018063.pdfIn PDF document text
    • http://universe1.space/craftsman_speed_start_mini_tiller1ls0w.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/washington_gas_customer_service_number_dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/33656491911.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/83039612364.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/bamojubulitudotafiwerofi.pdfIn PDF document text
    • http://fozajabuwipebo.epizy.com/jasajad.pdfIn PDF document text
    • http://buvinisupolo.rf.gd/77495758099.pdfIn PDF document text
    • http://kivekogifix.epizy.com/why_wont_my_acer_monitor_play_sound.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/how_to_get_driver_license_reinstated_in_mississippi.pdfIn PDF document text
    • http://sivutesafukim.rf.gd/13095344094.pdfIn PDF document text
    • http://burabovedi.rf.gd/wikubazuvisosefuxatut.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/does_bose_sounddock_portable_have_bluetooth.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D4 5340 bytes
SHA-256: 2c431553c60d81373b04b416b54e1116983bba6a29414e1d61549d9563a4459f
font_01_sfnt_off00011a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A14 11404 bytes
SHA-256: baa4aec56548cde5df8ec52c0376be4ba63a4d4b956e6e2d379139c373c79b2a