Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce1f1a8ced93161…

MALICIOUS

PDF

75.8 KB Created: 2021-02-25 01:12:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: fb74cae8f4506905ede8cb09fb9d0e29 SHA-1: cdd9ab5fed18acb39f59722bbec9a9f9d39e14cd SHA-256: dce1f1a8ced9316194c2873d288870cac33d15a029e1b09ccab03b4d1cd281ee
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links pointing to external PDF documents hosted on various domains, many of which are identified as disposable or potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, which may lead to compromised systems.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://yafferge.ru/strik?utm_term=wilton+icing+tips+chart In PDF document text
    • https://cdn.sqhk.co/wexazaruko/VUs8jc3/37876380386.pdfIn PDF document text
    • https://cdn.sqhk.co/dezosanag/xhjgjd8/my_talking_tom_hack_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/jdif4a4/screen_recorder_iphone_x_with_sound.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/1324852.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/xhhgege/53012884744.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/soleus_air_conditioner_window.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/PrKe5hh/hydraulic_star_picket_puller.pdfIn PDF document text
    • https://cdn.sqhk.co/kulabokirow/jcvgdjg/1412095934.pdfIn PDF document text
    • http://renijulemigato.iblogger.org/rheem_hot_water_heater_service_needed_light.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/1244177675.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/41943786335.pdfIn PDF document text
    • http://copyright-securityx.com/babemojazivegesepadexesujh901.pdfIn PDF document text
    • https://cdn.sqhk.co/kerikone/ghg9jjg/32781083801.pdfIn PDF document text
    • http://glawerry.online/p_a_full_form_in_english2xg8r.pdfIn PDF document text
    • http://kpovli.ru/bobisimitemofipagokoxanedjqeqk.pdfIn PDF document text
    • https://cdn.sqhk.co/dedenijikal/VhdHGYP/38470951903.pdfIn PDF document text
    • http://storezone.info/flower_anatomy_activity_worksheet_answersnzbso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/27276674487.pdfIn PDF document text
    • http://nemebikox.epizy.com/csc_economic_census_exam_questions_and_answers.pdfIn PDF document text
    • http://bedozev.rf.gd/certificate_of_practical_completion.pdfIn PDF document text
    • http://dufogatate.epizy.com/android_box_not_working_on_sky.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_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 5208 bytes
SHA-256: 9394225e2ed15a446f593e4732ad8a6e887df22f5d468623073add9d20efb935
font_01_sfnt_off0000fd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 10632 bytes
SHA-256: 55e82e813241f8bbf11eb184367534dab7342623bb0de1f7430a1e642fa83772