Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e3850421b35e95…

MALICIOUS

PDF

67.1 KB Created: 2021-02-24 05:59:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7090bf1379ccbe5ff81423386458a22a SHA-1: 159949c5636102570986c964ac37908166c9e027 SHA-256: 43e3850421b35e95cd06d01d62016dea3417761126aee26b3c9b30e33c9aecf8
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, with many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of multiple external URIs and a link farm heuristic strongly suggests an attempt to lure users to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://jacksth.ru/strik?utm_term=citizen+nighthawk+promaster PDF link annotation
    • http://reduslim-officialsite.site/mamenilupenuia7k9.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/Chagigf/slack_launch_app_on_login_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/gjigeia/samsung_pay_cashback_not_showing_up.pdfIn PDF document text
    • http://love-cosmetics.shop/1301815194li88x.pdfIn PDF document text
    • http://taptopbot.com/jewaxajukupubifay84pj.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/aLiaibi/fupudimuvololanimi.pdfIn PDF document text
    • http://disclosures.space/661076802226fprx.pdfIn PDF document text
    • https://jibizixowaxen.weebly.com/uploads/1/3/5/2/135296653/wunopedubovejonuluk.pdfIn PDF document text
    • https://cdn.sqhk.co/kataduzoni/jd5B6he/tazakunax.pdfIn PDF document text
    • https://cdn.sqhk.co/kadefowuvun/iiNbhdk/lidanekuxexuxe.pdfIn PDF document text
    • https://zisamezasebav.weebly.com/uploads/1/3/3/9/133997726/2ced7.pdfIn PDF document text
    • https://gojufepegaxop.weebly.com/uploads/1/3/4/3/134339744/41ab8c262733dc5.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/jccrahe/beholder_2_endings.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/idgckJR/world_war_iii_movies.pdfIn PDF document text
    • http://odemebayisitrafik.com/55684803444rl09w.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/sikuva/information_about_cricket_in_marathi_for_project.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/vizelenodedaxuxibumotok.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/beneath_2013_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/marketing_information_system_and_sales_order_process.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/33923809886.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_off0000c968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC968 5312 bytes
SHA-256: 292ff9204412c94e79372b6cff218f21ac3110e297cff78b0c09f43bceb44072
font_01_sfnt_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 10536 bytes
SHA-256: 92f8cca28e574026b402c43535fd98e5aaaafa2771ec03dab58fc89a6cda9104

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